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Akero Therapeutics, Inc
(NASDAQ:AKRO) 

AKRO stock logo

Akero Therapeutics, Inc., a cardio-metabolic nonalcoholic steatohepatitis (NASH) company, engages in the development of medicines designed to restore metabolic balance and improve overall health. Its lead product candidate is efruxifermin (EFX), an analog of fibroblast growth factor 21, which protec...

Founded: 2017
IPO Price: $16 (Jun 20, 2019)
Full Time Employees: 16
CEO: Andrew Cheng  
Sector: Healthcare
Industry: Biotechnology

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At a glance:
Bull Thesis:
Bear Thesis:
Main Competitors:
Moat:
Income Statements:
Quarterly
Annual
    Unit: USD2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 
                              
      operating expenses:
                              
      research and development
    78,883,000 69,254,000 69,567,000 69,293,000 72,232,000 55,322,000 50,650,000 53,392,000 38,634,000 27,985,000 21,787,000 18,320,000 25,087,000 21,363,000 20,514,000 27,711,000 19,470,000 23,976,000 10,602,000 9,801,750 17,379,000 13,037,000 8,791,000 13,138,000 13,885,000 5,960,000 
      general and administrative
    11,353,000 11,619,000 11,315,000 8,732,000 9,471,000 10,419,000 9,304,000 8,481,000 7,981,000 7,644,000 6,966,000 7,100,000 11,004,000 6,231,000 5,537,000 4,728,000 4,883,000 4,990,000 4,526,000 2,791,000 4,159,000 3,417,000 3,588,000 3,083,000 2,424,000 1,649,000 
      total operating expenses
    90,236,000 80,873,000 80,882,000 78,025,000 81,703,000 65,741,000 59,954,000 61,873,000 46,615,000 35,629,000 28,753,000 25,420,000 36,091,000 27,594,000 26,051,000 32,439,000 24,353,000 28,966,000 15,128,000 12,592,750 21,538,000 16,454,000 12,379,000 16,221,000 16,309,000 7,609,000 
      income from operations
    -90,236,000 -80,873,000 -80,882,000 -78,025,000 -81,703,000 -65,741,000 -59,954,000 -61,873,000 -46,615,000 -35,629,000 -28,753,000 -25,420,000 -36,091,000 -27,594,000 -26,051,000 -32,439,000 -24,353,000 -28,966,000 -15,128,000 -12,592,750 -21,538,000 -16,454,000 -12,379,000 -16,221,000 -16,309,000  
      yoy
    10.44% 23.02% 34.91% 26.11% 75.27% 84.52% 108.51% 143.40% 29.16% 29.12% 10.37% -21.64% 48.20% -4.74% 72.20% 157.60% 13.07% 76.04% 22.21% -22.37% 32.06%      
      qoq
    11.58% -0.01% 3.66% -4.50% 24.28% 9.65% -3.10% 32.73% 30.83% 23.91% 13.11% -29.57% 30.79% 5.92% -19.69% 33.20% -15.93% 91.47% 20.13% -41.53% 30.90% 32.92% -23.69% -0.54%   
      interest expense
    -1,092,000 -1,172,000 -1,154,000 -1,200,000 -1,246,000 -1,231,000 -991,000 -897,000 -888,000 -857,000 -457,000 -362,000 -324,000 -53,000             
      loss on extinguishment of loan payable
    -1,557,000                          
      interest and other income
    11,319,000 11,540,000 11,311,000 9,201,000 10,244,000 10,985,000 7,601,000                    
      net income
    -81,566,000 -70,505,000 -70,725,000 -70,024,000 -72,705,000 -55,987,000 -53,344,000 -55,186,000 -39,659,000 -31,083,000 -25,831,000 -23,059,000 -35,542,000 -27,403,000 -26,029,000 -32,424,000 -24,330,000 -28,933,000 -15,090,000 -12,374,000 -21,403,000 -16,207,000 -11,886,000    
      yoy
    12.19% 25.93% 32.58% 26.89% 83.33% 80.12% 106.51% 139.33% 11.58% 13.43% -0.76% -28.88% 46.08% -5.29% 72.49% 162.03% 13.68% 78.52% 26.96%        
      qoq
    15.69% -0.31% 1.00% -3.69% 29.86% 4.95% -3.34% 39.15% 27.59% 20.33% 12.02% -35.12% 29.70% 5.28% -19.72% 33.27% -15.91% 91.74% 21.95% -42.19% 32.06% 36.35%     
      net unrealized gain on marketable securities
    838,000 -97,000 137,000 -1,155,000 2,364,000   776,000 -255,000 -272,000                 
      comprehensive loss
    -80,728,000 -70,602,000 -70,588,000 -71,179,000 -70,341,000 -56,169,000 -53,693,000 -54,410,000 -39,914,000 -31,355,000 -25,847,000 -23,022,000 -35,539,000 -27,376,000 -26,032,000 -32,434,000 -24,338,000 -28,940,000 -15,089,000 -12,368,500 -21,477,000 -16,162,000 -11,835,000    
      net loss per common share, basic and diluted
    -990 -860 -900 -990 -1,050 -810 -900 -1,020 -710 -600 -550                
      weighted-average number of shares used in computing net loss per common share, basic and diluted
    82,008,267,000 81,721,387,000 78,656,629,000 67,136,772,000 69,442,136,000 69,160,484,000 59,307,759,000 52,568,159,000 55,613,120,000 51,867,854,000 46,944,059,000                
      net unrealized loss on marketable securities
         -182,000 -349,000                    
      other income
           4,156,500 7,844,000 5,403,000 3,379,000 2,723,000 873,000 244,000 22,000 15,000 23,000 33,000 38,000     610,000 755,000 381,000 
      net unrealized loss on short-term marketable securities
              -16,000                
      net unrealized gain on short-term marketable securities
               37,000 3,000 27,000 -3,000 -10,000 -8,000 -7,000 1,000 5,500 -74,000 45,000 51,000    
      net income per common share, basic and diluted
               -420 -920 -770 -740 -930 -700 -830 -430 -407.5 -630 -570 -420    
      weighted-average number of shares used in computing net income per common share, basic and diluted
               38,984,772,000 38,663,469,000 35,383,685,000 35,005,501,000 34,827,385,000 34,862,116,000 34,814,631,000 34,744,275,000  34,002,769,000 28,602,976,000 28,499,475,000    
      other income:
                              
      interest income
                       218,750 135,000 247,000 493,000    
      total other income
                       218,750 135,000 247,000 493,000 610,000 755,000 381,000 
      other incomes
                              
      other income, net:
                              
      change in fair value of preferred stock tranche obligation
                              
      change in fair value of anti-dilution right liability
                              
      net income and comprehensive loss
                           -7,036,000 -15,554,000  
      accretion of redeemable convertible preferred stock to redemption value
                              
      net income attributable to common stockholders
                           -15,611,000 -15,554,000 -7,228,000 
      net income per share
                           -0.24 -0.56 -2.21 
      weighted-average number of shares used in computing net income per share attributable to common stockholders, basic and diluted
                           15,070,728 28,024,779 3,268,390 
                              
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 
                                
        assets
                                
        current assets:
                                
        cash and cash equivalents
      176,032,000 220,449,000 185,922,000 340,238,000 316,065,000 310,355,000 623,854,000 234,207,000 269,546,000 444,156,000 257,884,000 249,773,000 374,003,000 177,727,000 150,489,000 150,483,000 164,935,000 157,538,000 187,960,000 187,242,000 192,679,000 63,247,000 47,245,000 64,788,000 147,835,000 162,654,000 
        short-term marketable securities
      561,794,000 521,866,000 500,371,000 402,840,000 401,182,000 449,839,000 279,811,000 315,803,000 285,186,000 195,288,000 85,338,000 101,676,000  2,998,000 14,887,000 37,775,000 50,146,000 72,490,000 62,024,000 81,145,000 99,191,000 39,586,000 78,040,000 71,612,000   
        prepaid expenses and other current assets
      16,709,000 22,285,000 26,858,000 27,302,000 29,641,000 15,816,000 7,615,000 9,952,000 21,247,000 3,759,000 4,267,000 3,724,000 3,943,000 3,422,000 2,558,000 5,324,000 6,726,000 6,194,000 5,792,000 2,958,000 6,163,000 10,360,000 933,000 1,649,000 2,238,000 454,000 
        total current assets
      754,535,000 764,600,000 713,151,000 770,380,000 746,888,000 776,010,000 911,280,000 559,962,000 575,979,000 643,203,000 347,489,000 355,173,000 377,946,000 184,147,000 167,934,000 193,582,000 221,807,000 236,222,000 255,776,000 271,345,000 298,033,000 113,193,000 126,218,000 138,049,000 150,073,000 163,108,000 
        long-term marketable securities
      250,490,000 343,931,000 442,003,000 54,751,000 69,824,000 88,133,000  19,283,000 58,264,000 19,451,000                 
        right of use asset
      552,000 621,000 689,000 755,000 820,000 884,000 946,000 1,008,000 1,068,000 1,127,000 1,185,000 1,242,000 1,297,000 1,352,000 1,406,000 1,459,000   1,612,000 1,662,000 1,710,000  226,000    
        total assets
      1,005,577,000 1,109,152,000 1,155,843,000 825,886,000 817,547,000 865,043,000 912,243,000 580,271,000 635,331,000 663,806,000 348,818,000 356,570,000 379,408,000 185,675,000 169,887,000 195,548,000 223,533,000 238,009,000 257,623,000 273,339,000 300,036,000 114,058,000 126,621,000 138,118,000 150,143,000 163,168,000 
        liabilities and stockholders' equity
                                
        current liabilities:
                                
        accounts payable
      20,399,000 13,249,000 10,831,000 9,027,000 25,223,000 14,568,000 13,783,000 7,038,000 11,454,000 10,121,000 7,080,000 7,968,000 6,010,000 6,877,000 4,450,000 6,706,000 6,784,000 2,307,000 4,605,000 3,428,000 4,636,000 2,536,000 1,535,000 947,000 93,000 3,248,000 
        accrued expenses and other current liabilities
      27,252,000 33,651,000 24,944,000 30,727,000 18,068,000 16,606,000 16,476,000 12,090,000 14,917,000 11,481,000 9,598,000 11,115,000 19,233,000 19,820,000 17,647,000 18,422,000 16,756,000 14,152,000 5,531,000 9,683,000 7,378,000 7,857,000 6,751,000 8,422,000 6,632,000 1,492,000 
        total current liabilities
      47,651,000 60,401,000 42,439,000 39,754,000 43,291,000 31,174,000 30,259,000 19,128,000 28,447,000 21,602,000 16,678,000 19,083,000 25,243,000 26,697,000 22,097,000 25,128,000 23,540,000 16,459,000 10,136,000 13,111,000 12,014,000 10,393,000 8,286,000 9,369,000 6,725,000 4,740,000 
        loan payable, noncurrent
       22,160,000 28,811,000 35,297,000 35,123,000 34,959,000 34,803,000 24,964,000 22,768,000 24,728,000 24,616,000 9,541,000 9,447,000 9,366,000             
        warrant liability
       400,000 296,000 194,000 203,000 164,000 178,000 54,000 93,000 85,000 162,000 305,000 70,000 41,000             
        operating lease liability, noncurrent
      289,000 372,000 451,000 529,000 605,000 679,000 750,000 819,000 888,000 954,000 1,017,000 1,079,000 1,140,000 1,199,000 1,255,000 1,311,000 1,365,000 1,417,000 1,467,000 1,516,000 1,564,000      
        total liabilities
      47,940,000 83,333,000 71,997,000 75,774,000 79,222,000 66,976,000 65,990,000 44,965,000 52,196,000 47,369,000 42,473,000 30,008,000 35,900,000 37,303,000 23,352,000 26,439,000 24,905,000 17,876,000 11,603,000 14,627,000 13,578,000 10,395,000 8,298,000 9,392,000 6,759,000 4,779,000 
        commitments and contingencies
                                
        stockholders’ equity:
                                
        common stock, 0.0001 par value...
      8,000 8,000 8,000 7,000 7,000 7,000 7,000 6,000 6,000 6,000 5,000 5,000 5,000 4,000 4,000 4,000 4,000 4,000 4,000 4,000 4,000 3,000 3,000 3,000 3,000 3,000 
        additional paid-in capital
      2,004,755,000 1,992,209,000 1,979,634,000 1,575,313,000 1,492,347,000 1,481,748,000 1,473,765,000 1,109,126,000 1,102,545,000 1,095,933,000 754,487,000 748,857,000 742,781,000 512,107,000 482,894,000 479,436,000 476,521,000 473,688,000 470,635,000 468,238,000 466,254,000 261,983,000 260,481,000 259,049,000 258,090,000 257,541,000 
        accumulated other comprehensive income
      1,826,000 988,000 1,085,000 948,000 2,103,000 -261,000 -79,000 270,000 -506,000 -251,000 21,000 37,000               
        accumulated deficit
      -1,048,952,000 -967,386,000 -896,881,000 -826,156,000 -756,132,000 -683,427,000 -627,440,000 -574,096,000 -518,910,000 -479,251,000 -448,168,000 -422,337,000 -399,278,000 -363,736,000 -336,333,000 -310,304,000 -277,880,000 -253,550,000 -224,617,000 -209,527,000 -179,816,000 -158,413,000 -142,206,000 -130,320,000 -114,709,000  
        total stockholders’ equity
      957,637,000 1,025,819,000 1,083,846,000 750,112,000 738,325,000 798,067,000 846,253,000 535,306,000 583,135,000 616,437,000 306,345,000 326,562,000 343,508,000 148,372,000 146,535,000 169,109,000 198,628,000 220,133,000 246,020,000 258,712,000 286,458,000 103,663,000 118,323,000 128,726,000 143,384,000 158,389,000 
        total liabilities and stockholders’ equity
      1,005,577,000 1,109,152,000 1,155,843,000 825,886,000 817,547,000 865,043,000 912,243,000 580,271,000 635,331,000 663,806,000 348,818,000 356,570,000 379,408,000 185,675,000 169,887,000 195,548,000 223,533,000 238,009,000 257,623,000 273,339,000 300,036,000 114,058,000 126,621,000    
        loan payable, current
       13,501,000 6,664,000      2,076,000                  
        liabilities and stockholders’ equity
                                
        property and equipment
          15,000 16,000 17,000 18,000 20,000 25,000 36,000 47,000 57,000 68,000 79,000 90,000 101,000 110,000 120,000 131,000 137,000      
        other assets, noncurrent
                108,000 108,000 108,000 108,000 468,000 417,000 114,000 115,000 115,000 201,000 156,000      
        accumulated other comprehensive loss
                   -3,000 -30,000 -27,000 -17,000 -9,000         
        operating lease right-of-use asset
                      1,511,000 1,562,000         
        other liabilities, noncurrent
                                
        accumulated other comprehensive gain
                          16,000 90,000 45,000    
        other assets
                           865,000 177,000 69,000 10,000  
        other liabilities
                           2,000 12,000 23,000 34,000 39,000 
        liabilities, redeemable convertible preferred stock and stockholders’ equity
                                
        redeemable convertible preferred stock (series a and b), 0.0001 par value...
                                
        stockholders’ equity
                                
        total liabilities, redeemable convertible preferred stock and stockholders’ equity
                             138,118,000 150,143,000 163,168,000 
        restricted cash
                              60,000 60,000 
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 
                                 
          cash flows from operating activities
                                 
          net loss
        -81,566,000 -70,505,000 -70,725,000 -70,024,000 -72,705,000 -55,987,000 -53,344,000 -55,186,000 -39,659,000 -31,083,000 -25,831,000               
          adjustments to reconcile net loss to net cash from operating activities:
                                 
          stock-based compensation expense
        9,261,000 9,055,000 8,784,000 7,176,000 7,468,000 7,656,000 7,398,000 6,116,000 5,739,000 4,798,000 4,844,000 4,040,000 11,731,000 4,161,000 3,311,000 2,642,000 2,612,000 2,436,000 2,364,000 1,916,000 1,546,000 1,323,000 1,237,000 670,000 483,000 
          depreciation
           15,000 1,000 1,000 1,000 2,000 5,000 11,000 11,000 10,000 11,000 11,000 11,000 11,000 9,000 10,000 11,000 11,000      
          non-cash lease expense
        69,000 68,000 66,000 65,000 64,000 62,000 62,000 60,000 59,000 58,000 57,000 55,000 55,000 54,000 53,000 52,000 51,000 50,000 50,000 49,000 40,000 53,000 54,000   
          net amortization of premiums and discounts on marketable securities
        -2,429,000 -2,860,000 -2,463,000                       
          amortization of debt issuance costs and discount
        179,000 186,000 178,000 174,000 164,000 157,000 112,000 120,000 116,000 112,000 100,000 94,000 94,000             
          loss on extinguishment of loan payable
                                 
          fair value change in warrant liability
        -400,000 104,000 102,000 -9,000 39,000 -13,000 500,000 -39,000 8,000 -77,000 187,000 235,000              
          unrealized foreign exchange gain and loss
           -86,000 86,000 3,000 -22,000 18,000 -6,000 5,000 -25,000 28,000 12,000 -15,000 -9,000 118,000          
          acquired in-process research and development expense
                               
          changes in operating assets and liabilities:
                                 
          prepaid expenses and other assets
        5,489,000 4,660,000 444,000 2,145,000 -13,761,000 -8,071,000 2,337,000 11,053,000 -17,421,000 133,000 -505,000 -545,000 535,000 -608,000 2,730,000 1,128,000 -381,000 -61,000 -2,787,000 3,161,000 4,880,000 -10,143,000 724,000 590,000 -1,794,000 
          accounts payable
        7,176,000 2,392,000 1,811,000 -16,110,000 10,569,000 1,093,000 6,456,000 -4,229,000 1,339,000 2,876,000 -631,000 1,676,000 -853,000 2,392,000 -2,247,000 -196,000 4,590,000 -2,298,000 1,177,000 -1,208,000 2,100,000 1,001,000 588,000 854,000 -1,597,000 
          accrued expenses and other current liabilities
        -6,408,000 8,699,000 -5,791,000 12,644,000 1,454,000 157,000 4,344,000 -2,836,000 3,430,000 2,224,000 -1,872,000 -7,793,000 -645,000 1,887,000 -782,000 1,661,000 2,601,000 8,618,000 -4,143,000 2,305,000 -711,000 1,459,000 -1,931,000 1,952,000 5,250,000 
          operating lease liability
        -73,000 -71,000 -70,000 -68,000 -66,000 -63,000 -62,000 -60,000 -60,000 -75,000 -36,000 -55,000 -52,000 -50,000 -49,000 -48,000 -47,000 -38,000 -49,000 -42,000 15,000     
          net cash from operating activities
        -67,171,000 -48,246,000 -67,664,000 -67,090,000 -70,424,000 -57,453,000 -35,140,000 -48,627,000 -49,719,000 -22,389,000 -24,632,000 -25,508,000 -24,624,000 -19,509,000 -22,876,000 -26,695,000 -14,606,000 -20,034,000 -18,346,000 -23,395,000 -13,508,000 -22,584,000 -11,317,000 -11,649,000  
          capital expenditures
        -5,000  
          free cash flows
        -67,171,000 -48,246,000 -67,664,000 -67,090,000 -70,424,000 -57,453,000 -35,140,000 -48,627,000 -49,719,000 -22,389,000 -24,632,000 -25,508,000 -24,624,000 -19,509,000 -22,876,000 -26,695,000 -14,606,000 -20,034,000 -18,346,000 -23,400,000 -13,508,000 -22,584,000 -11,317,000 -11,649,000  
          cash flows from investing activities
                                 
          purchase of short-term and long-term marketable securities
        -73,496,000 -75,676,000 -583,301,000 -79,728,000 -57,933,000 -339,407,000 -38,976,000 -58,214,000 -161,197,000                 
          proceeds from maturities of short-term marketable securities
        130,277,000 155,016,000 101,118,000 95,000,000 131,000,000 84,510,000 96,825,000 71,000,000 35,500,000 60,500,000 42,500,000 1,000 3,000,000 11,870,000 22,750,000 12,000,000 33,841,000 21,000,000 19,000,000 26,900,000 21,560,000 28,600,000 18,500,000   
          purchase of in-process research and development
                               
          net cash from investing activities
        56,781,000   15,272,000 73,067,000 -255,896,000 57,849,000 12,786,000 -125,697,000 -128,302,000 17,590,000 -101,445,000 3,000,000 11,870,000 22,750,000 12,000,000 21,934,000 -10,654,000 19,000,000 17,899,000 -59,844,000 38,465,000 -6,281,000   
          cash flows from financing activities
                                 
          proceeds from the exercise of stock options
        3,371,000 2,975,000 7,396,000 8,242,000 3,131,000 3,000 1,769,000 450,000 806,000 1,555,000 456,000 2,787,000 2,082,000 147,000 114,000 219,000 393,000 24,000 19,000 163,000 9,000 112,000 30,000 
          proceeds from the issuance of common stock pursuant to employee stock purchase plan purchases
          140,000   83,000   102,000   158,000   40,000     
          proceeds from the issuance of common stock and pre-funded warrants in a follow-on public offering
        378,350,000                       
          proceeds from the issuance of common stock in a follow-on public offering
                                
          proceeds from the issuance of common stock pursuant to the atm offering
        10,361,000 67,638,000 10,604,000                 
          proceeds from loan payable
           10,000,000 15,000,000             
          repayment of loan payable
                                 
          payment of debt and equity issuance costs
        -576,000 -29,000 -64,000 -477,000 -274,000 -31,000                 
          net cash from financing activities
        -34,027,000 3,433,000 395,531,000 75,991,000 3,067,000 -150,000 366,938,000 502,000 806,000 336,855,000 15,153,000 2,723,000 217,900,000 34,877,000 132,000 243,000 69,000 266,000 24,000 59,000 202,784,000 100,000 164,000 115,000 -1,607,000 
          net increase in cash and cash equivalents
        -44,417,000 34,527,000 -154,316,000                       
          cash and cash equivalents at the beginning of the period
        340,238,000                       
          cash and cash equivalents at the end of the period
        -44,417,000 34,527,000 185,922,000                       
          supplemental disclosures of cash flow information:
                                 
          cash paid for interest
        1,239,000 997,000 980,000 1,034,000 1,087,000 1,093,000 768,000 768,000 766,000 670,000 279,000 252,000              
          non-cash investing and financing information:
                                 
          change in net unrealizable gain on marketable securities
        838,000 -97,000 137,000 -1,155,000    776,000 -255,000   37,000 3,000 27,000 -3,000 -10,000 -8,000         
          warrant liability costs reclassified to additional paid-in equity on vested warrants issued
           431,000 330,000               
          debt and equity issuance costs included in accounts payable and accrued expenses and other current liabilities
           -8,000 -49,000 -416,000 480,000                   
          net (cash from) provided by investing activities
          -482,183,000                       
          write-off of deferred offering costs
               337,000               
          proceeds from the issuance of common stock pursuant to registered direct offering
                               
          proceeds from the issuance of common stock pursuant to private offering
                               
          net increase in cash, cash equivalents and restricted cash
           24,173,000 5,710,000 -313,499,000 389,647,000 -35,339,000 -174,610,000 186,164,000 8,111,000 -124,230,000 196,276,000 27,238,000 6,000 -14,452,000   678,000 -5,437,000 129,432,000   -83,047,000 -14,819,000 
          cash, cash equivalents and restricted cash at the beginning of the period
           234,207,000 249,881,000    187,390,000  64,848,000   
          cash, cash equivalents and restricted cash at the end of the period
             -313,499,000 623,854,000 -35,339,000 -174,610,000 186,164,000 257,992,000 -124,230,000 196,276,000    7,397,000 -30,422,000 188,068,000  129,432,000 15,981,000 47,414,000   
          deferred offering costs reclassified to additional paid-in equity
                             
          net amortization of premiums and discounts on short-term investments
            -3,737,000 -3,447,000 -2,922,000 -3,646,000 -3,269,000 -1,371,000 -1,268,000 -194,000 1,000 46,000 135,000 361,000 402,000 182,000 121,000 124,000 21,000 41,000 -103,000   
          stock options exercises included in other current assets
                                 
          proceeds from the issuance of common in a follow-on public offering
             344,839,000                   
          change in net unrealizable loss on marketable securities
             -182,000 -349,000                   
          purchase of short-term marketable securities
                  -24,910,000     -11,907,000   -8,996,000 -81,260,000 -24,781,000   
          payment of loan payable issuance costs
                  -25,000 -140,000             
          payment of follow-on public offering issuance costs
                  -278,000               
          payment of deferred offering costs
                   -40,000 -30,000 -46,000 -15,000 -29,000 -150,000         
          change in net unrealizable loss on short-term marketable securities
                  -16,000               
          deferred offering costs included in accounts payable and accrued expenses and other current liabilities
                  189,000 -8,000 15,000  -119,000         
          net income
                   -23,059,000 -35,542,000 -27,403,000 -26,029,000 -32,424,000 -24,330,000 -28,933,000 -15,090,000 -29,711,000 -21,403,000 -16,207,000 -11,886,000 -15,611,000 -15,554,000 
          adjustments to reconcile net income to net cash from operating activities:
                                 
          proceeds from the issuance of common stock in a follow-on public offering, net of underwriting costs
                                
          payment of private equity offering costs
                                
          equity issuance costs included in accounts payable and accrued expenses and other current liabilities
                   -78,000 154,000             
          supplemental disclosures of non-cash investing and financing information:
                                 
          debt issuance costs included in accounts payable and accrued expenses and other current liabilities
                                 
          cash, cash equivalents and restricted cash at the beginning of the year
                      150,591,000           
          cash, cash equivalents and restricted cash at the end of the year
                      150,597,000           
          other liabilities
                                 
          proceeds from sales of short-term marketable securities
                           -1,000     
          purchase of property and equipment
                           -5,000      
          proceeds from the issuance of common stock in follow-on public offering, net of issuance costs and underwriting fees
                                
          proceeds from the issuance of common stock in initial public offering, net of issuance costs and underwriting fees
                                 
          proceeds from the disgorgement of stockholders' short-swing profits
                           52,000   
          proceeds from the early exercise of stock options in exchange for restricted common stock
                               21,000 
          ​
                                 
          right of use asset obtained in exchange for operating lease liability
                                 
          remeasurement of right of use asset and operating lease liability
                                 
          conversion of convertible preferred stock into common stock
                               
          rou asset obtained in exchange for operating lease liability
                                 
          remeasurement of rou asset and lease liability
                                
          net decrease in cash, cash equivalents and restricted cash
                              -17,434,000   
          net unrealizable gain on marketable securities
                          1,000 -19,000 -74,000 45,000 51,000   
          proceeds from issuance of common stock in initial public offering, net of issuance costs and underwriting fees
                               -1,628,000 
          payment of initial public offering costs
                                 
          shares issued in connection with amgen agreement
                                 
          acquisition of technology in connection with amgen agreement
                                 
          issuance date fair-value of anti-dilution liability
                                 
          change in fair value of preferred stock tranche liability
                                 
          change in fair value of anti-dilution right liability
                                 
          proceeds from issuance of series a redeemable convertible preferred stock
                                 
          proceeds from issuance of series b redeemable convertible preferred stock
                                 
          payment of preferred stock issuance costs
                                 
          cash and restricted cash at the beginning of the year
                                 
          net unrealizable loss on marketable securities
                                 
          accretion of redeemable convertible preferred stock to redemption value
                                 
          issuance date fair value of preferred stock tranche obligation
                                 
          settlement of future purchase obligation
                                 
          issuance of series a redeemable convertible preferred stock in settlement of anti dilution right liability
                                 
          extinguishment of call option liability
                                 
          proceeds from issuance of redeemable convertible preferred stock, net of issuance costs
                                 
          cash and restricted cash at beginning of period
                                
          cash, cash equivalents and restricted cash at end of period
                                -14,819,000 
          common stock issued in connection with amgen agreement