7Baggers

Taysha Gene Therapies, Inc
(NASDAQ:TSHA) 

TSHA stock logo

Taysha Gene Therapies, Inc., a gene therapy company, focuses on developing and commercializing adeno-associated virus-based gene therapies for the treatment of monogenic diseases of the central nervous system. It primarily develops TSHA-101 for the treatment of GM2 gangliosidosis; TSHA-118 for the t...

Founded: 2019
CEO: R. A. Session  
Sector: Healthcare
Industry: Biotechnology

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At a glance:
Bull Thesis:
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Main Competitors:
Moat:
Income Statements:
Quarterly
Annual
    Unit: USD2026-03-31 2025-12-31 2025-09-30 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 
                           
      revenue
     5,485,000  1,986,000 2,302,000 2,022,000 1,788,000 1,112,000 3,411,000 3,604,000 4,746,000 2,395,000 4,706,000           
      yoy
    NaN% 171.27% NaN% 78.60% -32.51% -43.90% -62.33% -53.57% -27.52%               
      qoq
    NaN% NaN% NaN% -13.73% 13.85% 13.09% 60.79% -67.40% -5.36% -24.06% 98.16% -49.11%            
      operating expenses:
                           
      research and development
    33,809,000 24,952,000 25,745,000 20,141,000 15,565,000 15,325,000 14,946,000 15,073,000 20,657,000 12,682,000 11,791,000 19,791,000 12,514,000 13,861,000 16,391,000 23,118,000 37,799,000 37,918,000 39,528,000 30,643,000 23,854,000 12,260,000 11,057,000 
      general and administrative
    9,677,000 8,833,000 8,279,000 8,598,000 8,158,000 6,629,000 7,902,000 7,338,000 7,084,000 6,719,000 8,589,000 5,988,000 8,751,000 7,341,000 8,683,000 9,867,000 11,469,000 11,806,000 11,153,000 10,129,000 8,236,000 6,107,000 3,984,000 
      total operating expenses
    43,486,000 33,785,000 34,024,000 28,739,000 23,723,000 21,954,000 27,686,000 22,411,000 27,741,000 19,850,000 20,996,000 25,779,000 21,265,000 57,622,000 25,074,000 32,985,000 49,268,000 49,724,000 50,681,000 40,772,000 32,090,000 18,367,000 15,041,000 
      income from operations
    -43,486,000 -28,300,000 -34,024,000 -26,753,000 -21,421,000 -19,932,000 -25,898,000 -21,299,000 -24,330,000 -16,246,000 -16,250,000 -23,384,000 -16,559,000 -55,120,000 -25,074,000 -32,985,000 -49,268,000 -49,724,000 -50,681,000 -40,772,000 -32,090,000 -18,367,000 -15,041,000 
      yoy
    103.01% 41.98% 31.38% 25.61% -11.96% 22.69% 59.37% -8.92% 46.93% -70.53% -35.19% -29.11% -66.39% 10.85% -50.53% -19.10% 53.53% 170.72% 236.95%     
      qoq
    53.66% -16.82% 27.18% 24.89% 7.47% -23.04% 21.59% -12.46% 49.76% -0.02% -30.51% 41.22% -69.96% 119.83% -23.98% -33.05% -0.92% -1.89% 24.30% 27.06% 74.72% 22.11%  
      operating margin %
    NaN% -515.95% NaN% -1347.08% -930.54% -985.76% -1448.43% -1915.38% -713.28% -450.78% -342.39% -976.37% -351.87% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% 
      other income:
                           
      change in fair value of warrant liability
     -736,000 -292,000 -273,000 102,000 83,000 75,000 195,000 -337,000 65,738,000 -100,456,000             
      change in fair value of term loan
    -1,470,000 -1,643,000 -1,534,000 -1,461,000 -1,530,000 -548,000 -1,703,000 -1,279,000 -1,053,000               
      interest income
    2,586,000 2,870,000 3,169,000 1,859,000 1,326,000 1,700,000 2,107,000 1,440,000 1,693,000 1,921,000 1,109,000 223,000 319,000 199,000 9,000 27,000 14,000 29,000 37,000 40,000 66,000   
      interest expense
    -9,000 -12,000 -15,000 -17,000 -19,000 -22,000 -24,000 -27,000 -29,000 -713,000 -1,471,000 -1,440,000 -1,374,000 -796,000 -1,241,000 -912,000 -849,000 -691,000 -543,000 -194,000   -1,000 
      other income
    -31,000   -237,000 13,000   42,000    3,000 -8,000 -6,000 -1,000 -3,000 -8,000       
      total other income
    1,076,000 449,000 1,291,000 -129,000 -108,000 1,147,000 374,000 371,000 269,000 -25,778,500 -100,837,000 -1,214,000 -1,063,000 -603,000 -1,233,000 -888,000 -843,000 -662,000 -506,000 -154,000 66,000 49,000 -1,000 
      net income
    -42,410,000 -27,851,000 -32,733,000 -26,882,000 -21,529,000 -18,785,000 -25,524,000 -20,928,000 -24,061,000 47,741,000 -117,087,000 -24,598,000 -17,622,000 -55,723,000 -26,307,000 -33,873,000 -50,111,000 -50,386,000 -51,187,000 -40,926,000 -32,024,000 -18,318,000 -15,042,000 
      yoy
    96.99% 48.26% 28.24% 28.45% -10.52% -139.35% -78.20% -14.92% 36.54% -185.68% 345.08% -27.38% -64.83% 10.59% -48.61% -17.23% 56.48% 175.06% 240.29%     
      qoq
    52.27% -14.91% 21.77% 24.86% 14.61% -26.40% 21.96% -13.02% -150.40% -140.77% 376.00% 39.59% -68.38% 111.82% -22.34% -32.40% -0.55% -1.56% 25.07% 27.80% 74.82% 21.78%  
      net income margin %
    NaN% -507.77% NaN% -1353.58% -935.23% -929.03% -1427.52% -1882.01% -705.39% 1324.67% -2467.07% -1027.06% -374.46% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% -Infinity% 
      net loss per common share, basic and diluted
    -120 -80 -90 -90 -80 -70 -100 -90 -100 920 -930             
      weighted-average common shares outstanding, basic and diluted
    366,632,827,000 319,711,972,000 353,309,524,000 297,988,978,000 269,306,331,000 250,134,421,000 267,824,045,000 232,821,553,000 231,249,344,000 116,121,482,000 125,700,799,000 64,244,531,000 63,260,905,000 43,952,015,000 40,937,808,000 40,142,403,000 38,174,717,000 37,650,566,000 38,003,954,000 37,479,164,000 36,992,377,000 17,665,683,000 11,733,170,000 
      impairment of long-lived assets
          4,838,000   449,000 616,000             
      other expense
     -30,000 -37,000   -66,000 -81,000  -5,000 -23,000 -19,000             
      net income per common share, basic and diluted
               -380 -280 -1,010 -640 -840 -1,310 -1,330 -1,350 -1,090 -870 330 -1,280 
      change in fair value of preferred stock tranche liability
                           
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2026-03-31 2025-12-31 2025-09-30 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 
                             
        assets
                             
        current assets:
                             
        cash and cash equivalents
      276,576,000 319,767,000 297,344,000 312,761,000 116,593,000 139,036,000 157,688,000 172,743,000 123,980,000 143,940,000 164,278,000 45,083,000 63,425,000 87,880,000 34,306,000 66,239,000 96,630,000 149,103,000 188,785,000 197,370,000 228,684,000 251,253,000 278,634,000 
        restricted cash
      449,000 449,000 449,000 449,000 449,000 449,000 449,000 449,000 449,000 449,000 2,637,000 2,637,000 2,637,000 2,637,000 2,637,000 2,637,000 2,637,000 2,637,000 2,628,000     
        prepaid expenses and other current assets
      5,225,000 4,431,000 2,158,000 3,054,000 3,666,000 2,645,000 3,418,000 3,278,000 4,168,000 3,479,000 5,529,000 9,032,000 8,933,000 8,537,000 8,696,000 10,596,000 10,261,000 10,499,000 8,385,000 9,932,000 10,817,000 6,626,000  
        total current assets
      282,250,000 324,647,000 299,951,000 316,264,000 120,708,000 142,130,000 161,555,000 178,470,000 130,597,000 149,868,000 171,807,000 54,115,000 72,358,000 96,417,000 43,002,000 76,835,000 106,891,000 159,602,000 197,170,000 207,302,000 239,629,000 257,879,000 279,238,000 
        property, plant and equipment
      6,450,000 6,736,000 6,805,000 6,957,000 7,236,000 7,485,000 7,613,000 10,513,000 10,686,000 10,826,000 11,169,000 14,139,000 14,642,000 14,963,000 63,954,000 61,011,000 55,120,000 50,610,000 40,553,000 33,867,000 2,497,000   
        operating lease right-of-use assets
      9,155,000 9,439,000 7,463,000 7,773,000 8,079,000 8,381,000 8,678,000 8,971,000 9,261,000 9,582,000 9,852,000 10,348,000 10,647,000 10,943,000          
        other non-current assets
      181,000 183,000 184,000 186,000 188,000 217,000 220,000 288,000 304,000 304,000 304,000 304,000 1,316,000 1,316,000 1,245,000 1,206,000 673,000 440,000      
        total assets
      300,351,000 343,320,000 316,554,000 333,331,000 138,362,000 160,364,000 180,217,000 200,393,000 152,999,000 172,731,000 195,769,000 81,543,000 101,600,000 126,276,000 111,468,000 142,332,000 165,976,000 213,956,000 241,042,000 241,860,000 242,829,000 258,881,000 279,266,000 
        liabilities and stockholders' equity
                             
        current liabilities:
                             
        accounts payable
      4,564,000 6,275,000 5,438,000 7,713,000 4,326,000 3,592,000 4,932,000 8,718,000 10,380,000 6,366,000 7,520,000 10,766,000 9,002,000 10,946,000 15,251,000 23,967,000 21,997,000 21,763,000 22,051,000 6,355,000 4,083,000 1,994,000 8,837,000 
        accrued expenses and other current liabilities
      15,534,000 20,277,000 17,708,000 12,151,000 10,761,000 12,862,000 12,608,000 11,875,000 13,562,000 12,284,000 13,638,000 19,632,000 16,602,000 18,287,000 17,888,000 18,986,000 26,620,000 29,983,000 21,163,000 22,036,000 14,875,000 5,135,000  
        total current liabilities
      20,098,000 26,552,000 28,631,000 25,349,000 22,557,000 26,227,000 29,335,000 34,176,000 38,637,000 36,756,000 180,451,000 50,641,000 54,455,000 62,790,000 33,139,000 42,953,000 48,617,000 51,746,000 43,214,000 28,391,000 18,958,000 7,129,000 11,624,000 
        term loan
      48,961,000 50,106,000 50,852,000 41,051,000 42,453,000 43,942,000 42,971,000 37,835,000 40,512,000 40,508,000 38,548,000 38,354,000 38,161,000 37,967,000 37,773,000 37,580,000 37,386,000 37,192,000 27,812,000     
        operating lease liability, net of current portion
      17,766,000 18,172,000 16,506,000 16,808,000 17,093,000 17,361,000 17,751,000 18,134,000 18,499,000 18,953,000 19,101,000 19,528,000 19,928,000 20,440,000          
        other non-current liabilities
      1,582,000 1,552,000 1,576,000 1,396,000 1,200,000 1,309,000 1,363,000 1,380,000 1,502,000 1,577,000 3,832,000 3,922,000 4,004,000 4,130,000 3,934,000 3,480,000 3,496,000 3,735,000 3,015,000 765,000 999,000 450,000  
        total liabilities
      88,407,000 96,382,000 97,565,000 84,604,000 83,303,000 88,839,000 91,420,000 91,525,000 99,150,000 97,794,000 244,883,000 118,657,000 116,548,000 125,327,000 100,342,000 109,622,000 115,251,000 118,573,000 100,648,000 55,365,000 19,957,000 7,579,000 11,624,000 
        commitments and contingencies - note 13
                             
        stockholders' equity
                             
        preferred stock, 0.00001 par value per share...
                             
        common stock, 0.00001 par value per share...
      3,000 3,000 3,000 3,000 2,000 2,000 2,000 2,000 2,000 2,000 2,000 1,000 1,000 1,000 1,000 1,000        
        additional paid-in capital
      964,666,000 958,427,000 903,578,000 900,139,000 681,177,000 677,859,000 674,643,000 664,457,000 591,166,000 587,942,000 511,632,000 406,546,000 404,114,000 402,389,000 357,065,000 352,342,000 336,485,000 331,032,000 325,657,000 320,571,000 316,022,000 312,428,000 310,450,000 
        accumulated other comprehensive income
      985,000       2,405,000                
        accumulated deficit
      -753,710,000 -711,300,000 -683,449,000 -650,716,000 -623,834,000 -602,305,000 -583,520,000 -557,996,000 -537,068,000 -513,007,000 -560,748,000 -443,661,000 -419,063,000 -401,441,000 -345,940,000 -319,633,000 -285,760,000 -235,649,000 -185,263,000 -134,076,000 -93,150,000 -61,126,000 -42,808,000 
        total stockholders’ equity
      211,944,000 246,938,000 218,989,000 248,727,000 55,059,000 71,525,000 88,797,000 108,868,000 53,849,000 74,937,000    949,000 11,126,000 32,710,000 50,725,000 95,383,000 140,394,000 186,495,000 222,872,000 251,302,000 267,642,000 
        total liabilities and stockholders' equity
      300,351,000 343,320,000 316,554,000 333,331,000 138,362,000 160,364,000 180,217,000 200,393,000 152,999,000 172,731,000    126,276,000 111,468,000 142,332,000 165,976,000 213,956,000 241,042,000 241,860,000 242,829,000 258,881,000 279,266,000 
        deferred revenue
        5,485,000 5,485,000 7,470,000 9,773,000 11,795,000 13,583,000 14,695,000 18,106,000 18,759,000 20,243,000 28,851,000 33,557,000          
        accumulated other comprehensive loss
       -192,000 -1,143,000 -699,000 -2,286,000 -4,031,000 -2,328,000  -251,000               
        assets held for sale
             2,000,000 2,000,000 2,000,000 2,000,000             
        liabilities and stockholders' (deficit) equity
                             
        current liabilities
                             
        warrant liability
                140,534,000             
        deferred revenue, net of current portion
                2,951,000 6,212,000            
        stockholders' (deficit) equity
                             
        total stockholders’ (deficit) equity
                -49,114,000 -37,114,000 -14,948,000           
        total liabilities and stockholders' (deficit) equity
                195,769,000 81,543,000 101,600,000           
        revenue
                4,746,000 2,395,000 4,706,000           
        operating expenses:
                             
        research and development
                11,791,000 19,791,000 12,514,000           
        general and administrative
                8,589,000 5,988,000 8,751,000           
        impairment of long-lived assets
                616,000             
        total operating expenses
                20,996,000 25,779,000 21,265,000           
        income from operations
                -16,250,000 -23,384,000 -16,559,000           
        other income:
                             
        change in fair value of warrant liability
                -100,456,000             
        interest income
                1,109,000 223,000 319,000           
        interest expense
                -1,471,000 -1,440,000 -1,374,000           
        other income
                -19,000 3,000 -8,000           
        total other income
                -100,837,000 -1,214,000 -1,063,000           
        net income
                -117,087,000 -24,598,000 -17,622,000           
        net income per common share, basic and diluted
                -930 -380 -280           
        weighted-average common shares outstanding, basic and diluted
                125,700,799,000 64,244,531,000 63,260,905,000           
        commitments and contingencies - note 12
                             
        commitments and contingencies - note 11
                             
        build-to-suit lease liability
                    25,496,000 25,609,000 25,752,000 25,900,000 26,607,000 26,209,000    
        deferred lease asset
                    630,000 643,000 655,000 667,000 691,000 691,000 703,000 715,000  
        commitments and contingencies - note 9
                             
        commitments and contingencies - note 10
                             
        deferred offering costs
                          128,000   
        property and equipment
                           287,000 28,000 
        prepaid expenses
                            604,000 
        accrued expenses
                            2,727,000 
        due to related party
                            60,000 
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2026-03-31 2025-12-31 2025-09-30 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 
                              
          cash flows from operating activities
                              
          net loss
        -42,410,000 -27,851,000 -32,733,000 -26,882,000 -21,529,000 -18,785,000 -25,524,000 -20,928,000 -24,061,000 47,741,000             
          adjustments to reconcile net loss to net cash from operating activities:
                              
          depreciation expense
        295,000 299,000 286,000 277,000 283,000 304,000 294,000 322,000 325,000 366,000 331,000 343,000 331,000 364,000 277,000 274,000 257,000 209,000 166,000 85,000 32,000 6,000 
          stock-based compensation
        5,547,000 3,529,000 3,285,000 3,190,000 3,294,000 3,216,000 3,357,000 3,332,000 3,198,000 1,968,000 2,040,000 2,222,000 1,675,000 4,103,000 4,470,000 4,141,000 5,329,000 4,955,000 5,086,000 4,549,000 3,594,000 2,013,000 
          change in fair value of warrant liability
         736,000 292,000 273,000 -102,000 -83,000 -75,000 -195,000 337,000 -65,738,000             
          non-cash change in fair value of term loan
        32,000 205,000 186,000 185,000 256,000 -732,000 403,000 -21,000 -247,000              
          non-cash lease expense
        285,000 400,000 312,000 308,000 339,000 301,000 297,000 294,000 325,000 274,000 305,000 303,000 300,000          
          other
        27,000 32,000 28,000 241,000 -5,000 72,000 677,000 -26,000 27,000 160,000 194,000 259,000 128,000 290,000 229,000 193,000 194,000 295,000 -101,000    
          changes in operating assets and liabilities:
                              
          prepaid expenses and other assets
        -794,000 -2,135,000 971,000 482,000 -1,052,000 819,000 -741,000 822,000 -693,000 2,003,000 3,499,000 909,000 -400,000 108,000 1,900,000 -191,000 271,000 -1,831,000 1,752,000 902,000 -4,184,000  
          accounts payable
        1,289,000 -2,126,000 -1,948,000 2,998,000 923,000 -1,504,000 -3,781,000 -1,615,000 3,980,000 -1,230,000 -3,188,000 1,764,000 359,000 -4,587,000 -9,429,000 3,668,000 2,544,000 -1,506,000 13,618,000 510,000 1,872,000 -3,442,000 
          accrued expenses and other liabilities
        -5,149,000 2,674,000 5,008,000 732,000 -2,125,000 106,000 428,000 -2,377,000 422,000 -2,017,000 -2,936,000 -1,074,000 -250,000 -1,570,000 205,000 -7,420,000 -538,000 5,363,000 -2,874,000 11,870,000 3,183,000  
          deferred revenue
         -5,485,000 -1,986,000 -2,302,000 -2,022,000 -1,788,000 -1,112,000 -3,411,000 -3,604,000 -4,746,000 -2,395,000 -4,706,000          
          net cash from operating activities
        -40,878,000 -26,722,000 -24,166,000 -20,182,000 -22,020,000 -18,308,000 -21,615,000 -21,504,000 -19,798,000 -16,117,000 -17,949,000 -18,767,000 -20,185,000 14,277,000 -28,655,000 -33,208,000 -40,804,000 -40,258,000 -31,933,000 -22,816,000 -22,035,000 -19,848,000 
          capital expenditures
        -24,000 -250,000 -108,000 -2,000 -378,000 2,000 -35,000 -201,000 -140,000 -17,000 48,000 -3,900,000 -2,309,000 -2,020,000 -7,863,000 -8,427,000 -8,270,000 -3,502,000 -2,998,000 -534,000 -51,000 
          free cash flows
        -40,902,000 -26,972,000 -24,274,000 -20,184,000 -22,398,000 -18,306,000 -21,650,000 -21,705,000 -19,938,000 -16,134,000 -17,949,000 -18,719,000 -24,085,000 11,968,000 -30,675,000 -41,071,000 -49,231,000 -48,528,000 -35,435,000 -25,814,000 -22,569,000 -19,899,000 
          cash flows from investing activities
                              
          purchase of research and development license
        -3,000,000            -1,000,000 -250,000 -3,000,000 -250,000 -500,000    
          purchase of property, plant and equipment
        -24,000 -250,000 -108,000 -2,000 -378,000 2,000 -35,000 -201,000 -140,000 -17,000 48,000 -3,900,000 -2,309,000 -2,020,000 -7,863,000 -8,427,000 -8,270,000 -3,502,000 -2,998,000 -534,000  
          net cash from investing activities
        -3,024,000 -247,000 -48,000 62,000 -371,000 13,000 -35,000 -201,000 -140,000 -10,000 -3,490,000 48,000 -3,900,000 -2,370,000 -3,020,000 -8,113,000 -11,427,000 -8,520,000 -4,002,000 -8,498,000 -534,000 -6,051,000 
          cash flows from financing activities
                              
          payment of shelf registration costs
          14,000 -47,000      -387,000 -39,000 -92,000 -76,000 -151,000      
          proceeds from common stock issuances under espp
        176,000 84,000 75,000 63,000 26,000 18,000 50,000         
          proceeds from stock option exercises
        516,000 1,023,000                     
          net cash from financing activities
        711,000 49,556,000 8,797,000 216,288,000 -52,000 -357,000 6,595,000 70,468,000 -22,000 -4,248,000 140,634,000 377,000 -370,000 41,667,000 -258,000 10,930,000 -242,000 9,105,000    -1,482,000 
          net decrease in cash, cash equivalents and restricted cash
        -43,191,000    -22,443,000    -19,960,000   -18,342,000 -24,455,000 53,574,000 -31,933,000 -30,391,000 -52,473,000      
          cash, cash equivalents and restricted cash at the beginning of the period
        322,531,000 141,636,000 146,540,000 90,517,000 151,740,000     
          cash, cash equivalents and restricted cash at the end of the period
        279,340,000 22,587,000 -15,417,000 196,168,000 119,193,000 -18,652,000 -15,055,000 48,763,000 126,580,000 -20,375,000 119,195,000 -18,342,000 66,062,000 53,574,000 -31,933,000 -30,391,000 99,267,000 -39,673,000     
          cash and cash equivalents
        276,576,000 22,423,000 -15,417,000 196,168,000 116,593,000 -18,652,000 -15,055,000 48,763,000 123,980,000 -20,338,000 119,195,000 -18,342,000 63,425,000 53,574,000 -31,933,000 -30,391,000 96,630,000 -39,682,000     
          restricted cash
        2,764,000 164,000 2,600,000 2,600,000 -37,000 2,637,000 2,637,000 9,000     
          supplemental disclosure of cash flow information:
                              
          cash paid for interest
        1,447,000 1,450,000 1,363,000 1,292,000 1,294,000 1,302,000 1,325,000 1,326,000 1,329,000 1,287,000 1,266,000 1,274,000 1,125,000 1,017,000 823,000 516,000 419,000 531,000    
          supplemental disclosure of noncash investing and financing activities:
                              
          offering costs not yet paid
          -386,000 388,000 23,000 -314,000 -85,000   -405,000             
          research and development license expense
                   1,250,000 3,000,000 1,250,000 5,500,000 3,000,000 
          debt issuance costs expensed under the fair value option
                             
          impairment of long-lived assets
                449,000             
          proceeds from issuance of common stock and pre-funded warrants from underwritten public offering, net of underwriting discounts and sales commissions and other offering costs
         -70,000 -454,000   -360,000 6,659,000                
          proceeds from issuance of common stock pursuant to at-the-market offering, net of sales commissions and other offering costs
                              
          prepayment of 2023 trinity term loan
                             
          proceeds from 2025 trinity term loan
                             
          proceeds from issuance of common stock upon exercise of warrants
                              
          debt issuance costs for term loan
             -18,000              
          net increase in cash, cash equivalents and restricted cash
         22,587,000 -15,417,000   -18,652,000 -15,055,000   -20,375,000        -39,673,000     
          proceeds allocated to success fee liability
                             
          right-of-use assets obtained in exchange for lease liabilities
                              
          purchase of research and development license not yet paid
                       -250,000 1,250,000 2,750,000   5,500,000  
          non-cash impact of exercise of liability classified warrants
                              
          property, plant and equipment in accounts payable and accrued expenses
            213,000   52,000    112,000 636,000 644,000 -1,791,000 4,513,000 1,624,000 3,350,000 2,207,000 1,101,000  
          issuance costs for pre-funded warrant liability
                             
          non-cash loss on debt extinguishment
                              
          repayment of svb term loan
                              
          proceeds from trinity tern loan
                              
          proceeds from issuance of common stock and pre-funded warrants from private placement, net of placement agent commissions and other offering costs
                 -423,000             
          proceeds from issuance of common stock from private placement
                              
          reclassification of warrants to additional paid-in capital
                              
          allocation of proceeds to success fee liability
                              
          recognition of asset retirement obligation
                              
          issuance of warrants in connection with private placement
                            
          payment of offering costs
                              
          research and development license not yet paid
                              
          proceeds from trinity term loan
                              
          proceeds from at-the-market offering, net of sales commissions and other offering costs
                              
          proceeds from public offering of common stock, net of sales commissions and other offering costs
                              
          proceeds from issuance of common stock to astellas, net of offering costs
                              
          proceeds from issuance of common stock from private placement, net of sales commissions
                             
          proceeds from issuance of common stock, net of sales commissions
                             
          net income
                   -24,598,000 -17,622,000 -55,723,000 -26,307,000 -33,873,000 -50,111,000 -50,386,000 -51,187,000 -40,926,000 -32,024,000 -18,318,000 
          adjustments to reconcile net income to net cash from operating activities:
                              
          due to related party
                         -8,000  
          proceeds from term loan
                         9,979,000     
          acquisition of property, plant and equipment funded by landlord
                         -1,000 607,000  
          build-to-suit lease liability
                         -357,000 357,000    
          deferred offering costs not yet paid
                      -69,000 88,000 21,000 -63,000   128,000  
          espp contributions
                       44,000 277,000      
          change in fair value of preferred stock tranche liability
                             
          proceeds from initial public offering, net of underwriting discounts and commission and other offering costs
                              
          proceeds from series a convertible preferred stock, net of issuance costs
                              
          proceeds from series b convertible preferred stock, net of issuance costs
                              
          proceeds from note payable to related party
                              
          repayment of note payable to related party
                              
          reclassification of preferred stock tranche liability
                              
          allocation of preferred stock tranche liability
                             
          conversion of series a and series b convertible preferred stock to common stock
                             
          build-to-suit lease
                              
          issuance costs for issuance of common stock in initial public offering not yet paid
                              
          series a convertible preferred stock issuance costs not yet paid
                              
          proceeds from issuances of series a convertible preferred stock
                              
          payment of series a convertible preferred stock issuance costs
                              
          net increase in cash and cash equivalents
                           -31,314,000 -22,569,000 -27,381,000 
          cash at the beginning of the period
                           251,253,000  
          cash at the end of the period
                           -31,314,000 228,684,000 -27,381,000 
          series a issuance costs not yet paid
                              
          purchase of research and development licenses
                              
          purchase of property and equipment
                             -51,000 
          proceeds from issuance of common stock in initial public offering, net of underwriting discounts and commission and other offering costs
                             -1,308,000 
          proceeds from issuances of series a convertible preferred stock, net of issuance costs
                             -174,000 
          proceeds from issuance of series b convertible preferred stock, net of issuance costs
                             
          proceeds from notes payable to related party
                             
          repayment of notes payable to related party
                             
          property and equipment in accounts payable and accrued expenses
                              
          reclassification of preferred stock tranche liability upon share issuance
                             
          prepaid expenses
                              
          accrued expenses
                              
          issuance costs for issuances of common stock in initial public offering not yet paid
                              
          issuance costs for issuance of series a convertible preferred stock not yet paid