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Caribou Biosciences Inc
(NASDAQ:CRBU) 

CRBU stock logo

Caribou Biosciences is a biotechnology company that develops CRISPR technologies and allogenic cell therapies for oncology.

Founded: 2011
CEO / Co-Founder: Rachel Haurwitz 
Sector:
Industry:

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At a glance:
Bull Thesis:
Bear Thesis:
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 
                        
      licensing and other third-party revenue
    2,397,000                    
      operating expenses:
                        
      research and development
    20,611,000 23,815,000 22,401,000 27,692,000 35,531,000 30,464,000 30,421,000 35,480,000 33,788,000 31,279,000 28,584,000 26,503,000 25,709,000 25,736,000 19,991,000 22,579,000 13,924,000 15,111,000 15,833,000 12,327,000 
      general and administrative
    8,066,000 8,579,000 9,197,000 10,403,000 9,735,000 10,488,000 9,841,000 11,485,000 14,643,000 9,721,000 9,711,000 10,120,000 8,909,000 8,534,000 9,849,000 10,044,000 9,593,000 7,853,000 6,760,000 5,113,000 
      total operating expenses
    28,677,000 32,394,000 31,598,000 50,245,000 45,266,000 40,952,000 40,262,000 46,965,000 48,431,000 41,000,000 38,295,000 36,623,000 34,618,000 34,270,000 29,840,000 32,623,000 23,517,000 22,964,000 22,593,000 17,440,000 
      income from operations
    -26,280,000 -28,453,000 -29,400,000 -47,578,000 -42,913,000 -38,875,000 -38,238,000 -43,501,000 -46,002,000 -37,442,000 -14,633,000 -32,868,000 -31,116,000 -30,578,000 -26,537,000 -28,431,000 -20,853,000 -20,405,000 -18,616,000 -15,964,000 
      yoy
    -38.76% -26.81% -23.11% 9.37% -6.71% 3.83% 161.31% 32.35% 47.84% 22.45% -44.86% 15.61% 49.22% 49.86% 42.55% 78.09%     
      qoq
    -7.64% -3.22% -38.21% 10.87% 10.39% 1.67% -12.10% -5.44% 22.86% 155.87% -55.48% 5.63% 1.76% 15.23% -6.66% 36.34% 2.20% 9.61% 16.61%  
      other income
    1,195,000 2,200,000 1,852,000 2,187,000 2,588,000 3,040,000 3,732,000 4,111,000 4,465,000 4,822,000 4,774,000 3,048,000 2,832,000 2,331,000 1,466,000 698,000  13,000 23,000 25,000 
      total other income
    1,195,000 1,415,000 1,852,000 -6,520,000 2,922,000 3,376,000 3,554,000 5,804,000 4,768,000 3,130,000 4,631,000 3,349,000 3,072,000 3,659,000 -110,000 1,734,000 1,765,000 2,247,000 -2,358,000 1,653,000 
      net income
    -25,085,000 -26,488,000 -27,548,000 -54,098,000 -39,991,000 -35,490,000 -34,684,000 -37,697,000 -41,234,000 -34,505,000 -10,002,000 -29,519,000 -28,044,000 -26,989,000 -26,647,000 -26,697,000 -19,088,000    
      yoy
    -37.27% -25.36% -20.57% 43.51% -3.01% 2.85% 246.77% 27.70% 47.03% 27.85% -62.46% 10.57% 46.92%        
      qoq
    -5.30% -3.85% -49.08% 35.28% 12.68% 2.32% -7.99% -8.58% 19.50% 244.98% -66.12% 5.26% 3.91% 1.28% -0.19% 39.86%     
      other comprehensive loss
                        
      net unrealized loss on available-for-sale marketable securities, net of tax
    -126,000    -88,000         -475,000 -454,000 -492,000 -954,000    
      net comprehensive loss
    -25,211,000 -26,478,000 -27,495,000 -54,225,000 -40,079,000 -36,024,000 -33,576,000 -37,694,000 -41,586,000 -33,494,000 -9,847,000 -29,925,000 -27,256,000 -26,472,000 -27,101,000 -27,189,000 -20,042,000    
      net income per share
    -0.26 -0.28 -0.3 -0.58 -0.43 -0.39 -0.38 -0.42 -0.46 -0.4 -0.12 -0.48 -0.46 -0.45 -0.44 -0.44 -0.32 0.09 -0.46 -1.39 
      weighted-average common shares outstanding, basic and diluted
    95,861,716 93,389,283 93,293,099 93,028,698 92,679,493 90,317,925 90,455,900 90,340,932 89,302,937 73,807,597 83,783,992 61,417,934 61,186,514 60,801,133 60,886,921 60,757,689 60,546,170 31,663,243 45,889,646 10,261,770 
      licensing and collaboration revenue
     3,941,000 2,198,000 2,667,000 2,353,000 2,077,000 2,024,000 3,464,000 2,429,000 3,558,000 23,662,000 3,755,000 3,502,000 3,692,000 3,303,000 4,192,000 2,664,000 2,559,000 3,977,000 1,476,000 
      impairment charges
       12,150,000                 
      other income:
                        
      impairment of equity investment
       -9,158,000                 
      change in fair value of the mskcc success payments liability
     196,250  451,000 334,000 220,000 -164,000 1,795,000 303,000 -1,683,000 -139,000 279,000 255,000 1,388,000 -1,607,000 1,052,000 1,596,000 2,158,000 -2,403,000  
      other comprehensive income
                        
      net unrealized gain on available-for-sale marketable securities, net of tax
     10,000 53,000 -127,000  -534,000 1,108,000 3,000 -352,000 134,250 155,000 -406,000 788,000        
      change in fair value of equity securities
         -29,000 -14,000 -102,000  -9,000 -4,000 22,000 -15,000 -60,000 31,000 -16,000 -88,000    
      other comprehensive income:
                        
      gain on extinguishment of ppp loan
                       1,584,000 
      other comprehensive loss:
                        
      other income - net
                    257,000    
      interest income
                     76,000 22,000 46,000 
      interest expense
                       -2,000 
      net loss before provision for income taxes
                     -18,158,000 -20,974,000 -14,311,000 
      benefit from income taxes
                        
      net loss and comprehensive loss
                     -12,111,000 -20,974,000 -14,311,000 
    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 
                          
        assets
                          
        current assets
                          
        cash and cash equivalents
      12,057,000 12,360,000 11,144,000 25,201,000 29,417,000 16,293,000 31,970,000 37,866,000 49,400,000 51,162,000 104,058,000 66,194,000 52,744,000 58,338,000 82,085,000 112,146,000 147,630,000 240,420,000 435,310,000 129,524,000 
        marketable securities, short-term
      105,569,000 126,980,000 136,115,000 158,747,000 179,048,000 193,244,000 196,208,000 223,783,000 244,588,000 277,665,000 234,430,000 193,038,000 175,794,000 189,325,000 211,284,000 227,778,000 206,101,000 135,412,000   
        accounts receivable
      227,000 69,000 242,000 71,000 88,000 265,000 184,000 215,000 917,000 148,000 1,133,000 766,000 1,533,000 202,000 397,000 524,000 374,000 1,153,000 578,000 2,000 
        contract assets
      691,000 1,006,000 860,000 753,000 808,000 1,158,000 798,000 972,000 971,000 1,425,000 1,658,000 1,481,000 1,639,000 2,247,000 1,899,000 2,093,000 1,494,000 1,488,000 1,853,000 830,000 
        other receivables
      1,445,000 1,904,000 1,828,000 1,956,000 1,844,000 1,828,000 1,683,000 1,729,000 1,725,000 2,286,000 2,345,000 1,495,000 1,670,000 2,215,000 2,699,000 3,094,000 4,169,000 5,483,000 5,354,000 7,575,000 
        prepaid expenses and other current assets
      2,392,000 2,913,000 5,317,000 5,778,000 6,118,000 6,589,000 6,583,000 6,317,000 6,913,000 6,155,000 7,069,000 5,564,000 6,110,000 7,921,000 8,558,000 7,293,000 8,242,000 7,236,000 5,952,000 5,036,000 
        total current assets
      122,381,000 145,232,000 155,506,000 192,506,000 217,323,000 219,377,000 237,426,000 270,882,000 304,514,000 338,841,000 350,693,000 268,538,000 239,490,000 260,248,000 306,922,000 352,928,000 368,010,000 391,192,000 449,047,000 142,967,000 
        non-current assets
                          
        marketable securities, long-term
      1,001,000 3,505,000 11,953,000  3,987,000 39,849,000 52,837,000 50,124,000 51,938,000 43,577,000 58,219,000 33,289,000 62,452,000 69,373,000 49,221,000 26,152,000 37,092,000 37,676,000   
        property and equipment
      6,123,000 6,760,000 7,598,000 8,179,000 18,519,000 19,281,000 19,565,000 19,876,000 19,167,000 18,270,000 16,598,000 15,429,000 12,646,000 10,678,000 8,959,000 8,006,000     
        operating lease, right of use assets
      17,356,000 17,670,000 16,004,000 16,461,000 19,520,000 20,009,000 20,493,000 21,134,000 21,659,000 22,182,000 22,680,000 23,206,000 23,715,000 24,230,000 24,626,000 25,250,000     
        other assets
      2,137,000 2,200,000 3,780,000 3,625,000 5,042,000 5,521,000 4,741,000 1,636,000 1,794,000 1,586,000 1,568,000 1,419,000 1,476,000 1,538,000 1,336,000 1,303,000 1,464,000 975,000 810,000 3,396,000 
        total assets
      148,998,000 175,367,000 194,984,000 220,903,000 273,656,000 313,313,000 344,334,000 372,938,000 406,825,000 432,209,000 457,521,000 349,647,000 347,462,000 373,765,000 398,823,000 421,367,000 445,997,000 442,356,000 461,960,000 158,397,000 
        liabilities and stockholders’ equity
                          
        current liabilities
                          
        accounts payable
      3,503,000 5,783,000 3,804,000 3,243,000 3,873,000 2,476,000 2,704,000 3,227,000 5,940,000 3,120,000 2,377,000 4,433,000 2,651,000 1,146,000 1,228,000 426,000 1,814,000 3,990,000 3,482,000 4,029,000 
        accrued expenses and other current liabilities
      13,889,000 16,535,000 19,350,000 20,528,000 19,888,000 23,620,000 25,448,000 23,626,000 18,990,000 21,135,000 18,230,000 15,901,000 12,544,000 16,079,000 14,638,000 14,910,000 11,190,000 13,136,000 13,930,000 13,297,000 
        operating lease liabilities, current
      1,287,000 1,201,000 2,687,000 2,287,000 1,901,000 1,426,000 1,178,000 1,262,000 1,264,000 1,200,000           
        deferred revenue
      994,000 1,895,000 2,217,000 2,829,000 2,829,000 3,129,000 2,829,000 2,829,000 2,827,000 2,847,000 2,826,000 12,962,000 10,883,000 9,937,000 12,036,000 12,642,000 12,838,000 8,703,000 8,746,000 8,681,000 
        total current liabilities
      19,673,000 25,414,000 28,058,000 28,887,000 28,491,000 30,651,000 32,159,000 30,944,000 29,021,000 28,302,000 24,572,000 34,375,000 27,100,000 28,128,000 28,814,000 28,855,000 26,667,000 25,829,000 26,158,000 26,007,000 
        long-term liabilities
                          
        deferred revenue, net of current portion
      1,648,000 1,752,000 1,756,000 1,772,000 2,621,000 3,317,000 3,947,000 4,604,000 5,428,000 6,102,000 6,728,000 18,162,000 13,911,000 15,954,000 15,423,000 15,626,000 17,326,000 22,032,000 23,022,000 24,208,000 
        operating lease liabilities, non-current
      25,659,000 26,026,000 22,777,000 23,564,000 24,323,000 25,061,000 25,463,000 25,528,000 25,895,000 25,908,000           
        total liabilities
      46,980,000 53,192,000 53,139,000 54,771,000 56,434,000 60,362,000 63,131,000 62,474,000 63,536,000 63,808,000 59,253,000 80,189,000 69,190,000 72,894,000 74,709,000 73,478,000 74,200,000 54,531,000 57,559,000 55,938,000 
        commitments and contingencies
                          
        stockholders’ equity
                          
        common stock, par value 0.0001...
      10,000 9,000 9,000 9,000 9,000 9,000 9,000 9,000 9,000 8,000 8,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 6,000 1,000 
        additional paid-in-capital
      723,631,000 718,578,000 711,770,000 708,562,000 705,427,000 701,077,000 693,305,000 688,990,000 684,121,000 667,648,000 664,021,000 525,366,000 504,255,000 499,598,000 496,369,000 493,043,000 489,762,000 485,748,000 483,710,000 10,649,000 
        accumulated other comprehensive income
      -23,000 103,000 93,000 40,000 167,000 255,000 789,000 -319,000 -322,000 30,000           
        accumulated deficit
      -621,600,000 -596,515,000 -570,027,000 -542,479,000 -488,381,000 -448,390,000 -412,900,000 -378,216,000 -340,519,000 -299,285,000 -264,780,000 -254,778,000 -225,259,000 -197,215,000 -170,226,000 -143,579,000 -116,882,000 -97,794,000 -79,315,000 -58,341,000 
        total stockholders’ equity
      102,018,000 122,175,000 141,845,000 166,132,000 217,222,000 252,951,000 281,203,000 310,464,000 343,289,000 368,401,000 398,268,000 269,458,000 278,272,000 300,871,000 324,114,000 347,889,000 371,797,000 387,825,000 404,401,000  
        total liabilities and stockholders’ equity
      148,998,000 175,367,000 194,984,000 220,903,000 273,656,000 313,313,000 344,334,000 372,938,000 406,825,000 432,209,000 457,521,000 349,647,000 347,462,000 373,765,000 398,823,000 421,367,000 445,997,000    
        current assets:
                          
        investments in equity securities
        143,000 132,000 9,265,000 9,276,000 9,272,000 9,286,000 7,753,000 7,753,000 7,763,000 7,766,000 7,683,000 7,698,000 7,759,000 7,728,000 7,666,000 7,626,000 7,626,000 7,626,000 
        current liabilities:
                          
        mskcc success payments liability
          451,000 785,000 1,005,000 841,000 2,636,000 2,939,000 1,256,000 1,117,000 1,396,000 1,651,000 3,039,000 1,432,000 2,484,000 4,080,000 6,238,000  
        deferred tax liabilities
        548,000 548,000 548,000 548,000 557,000 557,000 556,000 557,000 381,000 380,000 382,000 381,000 475,000 475,000 476,000 476,000 155,000 155,000 
        lease liabilities, current
                1,139,000 1,079,000 1,022,000 966,000 912,000      
        lease liabilities, non-current
                26,316,000 26,155,000 26,401,000 26,780,000 26,958,000 27,090,000 27,238,000    
        preferred stock, par value 0.0001...
                          
        accumulated other comprehensive loss
                -981,000 -1,136,000 -730,000 -1,518,000 -2,035,000 -1,581,000 -1,089,000 -135,000   
        deferred rent and lease incentive liability
                       2,097,000 1,833,000 1,570,000 
        other liabilities
                      9,000 17,000 153,000 163,000 
        lease liabilities
                     877,000 825,000    
        property and equipment - net
                      6,016,000 4,887,000   
        operating lease, right of use asset
                      25,749,000    
        liabilities, convertible preferred stock, and stockholders’ equity
                          
        promissory note — ppp loan
                          
        promissory note — ppp loan, net of current portion
                          
        convertible preferred stock, par value 0.0001...
                         150,150,000 
        total liabilities, convertible preferred stock, and stockholders’ equity
                       442,356,000 461,960,000  
        property and equipment—net
                        4,477,000 4,408,000 
        liabilities, convertible preferred stock, and stockholders’ deficit
                          
        success payments liability
                         3,835,000 
        stockholders’ deficit
                          
        total stockholders’ deficit
                         -47,691,000 
        total liabilities, convertible preferred stock, and stockholders’ deficit
                         158,397,000 
      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 
                           
          cash flows from operating activities:
                           
          net loss
        -25,085,000 -26,488,000 -27,548,000 -54,098,000 -39,991,000 -35,490,000 -34,684,000 -37,697,000 -41,234,000 -34,505,000 -10,002,000 -29,519,000 -28,044,000 -26,989,000 -26,647,000 -26,697,000 -19,088,000 -18,479,000 -20,974,000 
          adjustments to reconcile net loss to net cash from operating activities:
                           
          depreciation and amortization
        649,000 682,000 631,000 1,167,000 1,165,000 1,184,000 1,177,000 856,000 710,000 740,000 1,579,000 617,000 589,000 506,000 450,000 358,000 308,000 273,000 260,000 
          change in fair value of equity securities
         115,000 -12,000 -15,000 11,000 -5,000 14,000   9,000 4,000 -22,000 15,000 60,000 -31,000 16,000 88,000   
          stock-based compensation expense
        2,357,000 2,738,000 2,931,000 3,129,000 3,882,000 3,911,000 4,069,000 4,738,000 3,988,000 3,556,000 3,478,000 3,585,000 3,131,000 3,101,000 2,673,000 2,918,000 3,024,000 1,578,000 935,000 
          change in fair value of success payments liability
                           
          accretion of discounts on investments in marketable securities
        -269,000 -160,000 -235,000 -293,000 -452,000 -1,018,000 -1,223,000 -946,000 -1,539,000           
          non-cash lease expense
        315,000 422,000 457,000 475,000 490,000 483,000 642,000 524,000 524,000 497,000 527,000 509,000 515,000 397,000 622,000 500,000 500,000   
          changes in operating assets and liabilities:
                           
          accounts receivable
        -158,000 173,000 -171,000 17,000 177,000 -81,000 32,000 702,000 -770,000 985,000 -367,000 767,000 -1,331,000 195,000 127,000 -150,000 779,000 -575,000 -576,000 
          contract assets
        315,000 -146,000 -107,000 55,000 350,000 -361,000 175,000 -1,000 454,000 234,000 -177,000 158,000 607,000 -348,000 195,000 -600,000 -6,000 365,000 -1,023,000 
          other receivables
        459,000   -112,000 -17,000 -145,000 46,000 -4,000 561,000 59,000 -850,000 175,000 545,000 485,000 395,000 1,075,000 1,313,000 -127,000 2,221,000 
          prepaid expenses and other current assets
        522,000 2,403,000 461,000 340,000 471,000 -5,000 -266,000 596,000 -758,000 914,000 -1,504,000 545,000 1,811,000 638,000 -1,266,000 949,000 -1,296,000 -1,284,000 -917,000 
          other assets
        63,000 1,609,000 -155,000 1,417,000 479,000 -780,000 -3,105,000 159,000 -209,000 -18,000 -149,000 57,000 62,000 -203,000 -35,000 161,000 -487,000 -165,000 
          accounts payable
        -2,220,000 1,919,000 561,000 -630,000 1,404,000 -229,000 -477,000 -2,368,000 2,720,000 730,000 -953,000 540,000 1,502,000 -153,000 989,000 -1,642,000 -1,915,000 291,000 -183,000 
          accrued expenses and other current liabilities
        -2,646,000 -2,816,000 -1,111,000 688,000 -3,101,000 -2,207,000 1,578,000 4,967,000 -2,204,000 2,895,000 3,279,000 3,707,000 -4,138,000 1,044,000 -208,000 3,948,000 -2,831,000 -574,000 3,846,000 
          deferred revenue, current and long-term
        -1,005,000 -326,000 -627,000 -849,000 -996,000 -330,000 -658,000 -821,000 -694,000 -606,000 -21,568,000 6,328,000 -1,097,000 -1,567,000 -807,000 -1,898,000 -572,000 -1,032,000 -1,122,000 
          operating lease liabilities
        -281,000 -325,000 -389,000 -372,000 -263,000 -154,000 -149,000 -369,000 51,000 -346,000 220,000 -188,000 -323,000 -124,000 -97,000 -97,000 -85,000   
          net cash from operating activities
        -26,984,000 -20,824,000 -25,185,000 -28,258,000 -36,725,000 -35,470,000 -32,661,000 -32,866,000 -37,203,000 -21,379,000 -28,788,000 -15,185,000 -27,939,000 -25,044,000 -22,376,000 -21,873,000 -21,673,000 -21,389,000 -14,967,000 
          capital expenditures
         216,000 -115,000 -466,000 -927,000 -137,000 -475,000 -2,917,000 -597,000 -2,141,000 -6,758,000 -1,705,000 -317,000 -1,757,000 -1,304,000 -2,620,000 -723,000 -685,000 -930,000 
          free cash flows
         -20,608,000 -25,300,000 -28,724,000 -37,652,000 -35,607,000 -33,136,000 -35,783,000 -37,800,000 -23,520,000 -35,546,000 -16,890,000 -28,256,000 -26,801,000 -23,680,000 -24,493,000 -22,396,000 -22,074,000 -15,897,000 
          cash flows from investing activities:
                           
          proceeds from maturities of marketable securities
        46,142,000 61,788,000 68,414,000 56,673,000 65,955,000   107,801,000 97,088,000           
          purchases of marketable securities
        -22,085,000 -44,034,000 -57,448,000 -32,219,000 -15,532,000 -55,504,000 -93,470,000 -84,235,000 -71,184,000 -84,192,000 -175,892,000 -58,743,000 -75,931,000 -86,511,000 -70,806,000 -71,062,000 -110,684,000   
          purchases of property and equipment
        -72,000 216,000 -115,000 -418,000 -1,042,000 -518,000 -673,000 -2,241,000 -1,448,000 -2,277,000 -4,752,000 -2,553,000 -2,031,000 -1,757,000 -1,354,000 -2,620,000 -723,000 -685,000 -930,000 
          net cash from investing activities
        23,985,000 17,970,000 10,851,000 24,036,000 49,381,000 15,930,000 26,521,000 21,200,000 22,956,000 -31,474,000 -68,476,000 11,064,000 20,703,000 1,170,000 -8,339,000 -13,973,000 -72,107,000 -173,961,000 -1,930,000 
          cash flows from financing activities:
                           
          proceeds from exercise of stock options
        9,000     130,000 489,000         460,000  
          proceeds from issuances of common stock under espp
        468,000 277,000 468,000 1,000              
          proceeds from issuances of common stock related to atm, net of offering expenses
        2,219,000                   
          net cash from financing activities
        2,696,000 4,070,000 277,000 6,000 468,000 3,863,000 244,000 132,000 12,485,000 -43,000 135,128,000 17,571,000 1,642,000 127,000 654,000 362,000 990,000 460,000 322,683,000 
          net increase in cash, cash equivalents, and restricted cash
        -303,000   -4,216,000 13,124,000  -5,896,000    37,864,000   -23,747,000 -30,061,000 -35,484,000 -92,790,000 -194,890,000 305,786,000 
          cash, cash equivalents, and restricted cash — beginning of period
        12,406,000 16,339,000 51,208,000 58,384,000 46,000 -46,000 240,466,000 
          cash, cash equivalents, and restricted cash — end of period
        12,103,000 1,216,000 -14,057,000 -4,216,000 29,463,000 -15,677,000 -5,896,000 -11,534,000 49,446,000 -52,896,000 37,864,000 13,450,000 52,790,000 -23,747,000 -30,015,000 -35,530,000 147,676,000 -194,890,000 305,786,000 
          reconciliation of cash, cash equivalents, and restricted cash
                           
          cash and cash equivalents
        12,057,000 1,216,000 -14,057,000 -4,216,000 29,417,000 -15,677,000 -5,896,000 -11,534,000 49,400,000 -52,896,000 37,864,000 13,450,000 52,744,000 -23,747,000 -30,061,000 -35,484,000 147,630,000 -194,890,000 305,786,000 
          restricted cash
        46,000 46,000 46,000 46,000 46,000 
          cash, cash equivalents, and restricted cash on the balance sheet
        12,103,000 1,216,000 -14,057,000 -4,216,000 29,463,000 -15,677,000 -5,896,000 -11,534,000 49,446,000        147,676,000 -194,890,000 305,786,000 
          supplemental schedule of non-cash investing and financing activities:
                           
          purchases of property and equipment included in accounts payable and accrued expenses
           -48,000 115,000 381,000 198,000 -676,000 851,000 136,000 -2,006,000 848,000 1,714,000       
          gain on disposal of fixed assets
                 -34,000       
          non-cash consideration for licensing and collaboration revenue
               -77,000 -128,000   
          change in fair value of mskcc success payments liability
         -451,000 -334,000 -220,000 164,000 -1,795,000 -303,000 1,683,000 139,000 -279,000 -255,000 -1,388,000 1,607,000 -1,052,000 -1,596,000 -2,158,000  
          acquired in-process research and development
             125,000 1,500,000     300,000   
          impairment charges
                         
          impairment of equity investment
                         
          deferred tax liabilities
                           
          proceeds from sale of property and equipment
                           
          payments to acquire in-process research and development
             -125,000 -1,500,000     -300,000     
          net decrease in cash, cash equivalents, and restricted cash
         1,216,000       -1,762,000    -5,594,000       
          right-of-use-assets recognized due to lease remeasurement
                           
          loss on disposal of fixed assets
                          
          proceeds from sales and maturities of marketable securities
             71,939,000    54,995,000 112,168,000 72,360,000 98,665,000       
          proceeds from follow-on public offering, net of offering expenses
                           
          proceeds from issuances of common stock in a private placement with pfizer
                           
          supplemental cash flow information:
                           
          cash paid for income taxes
                       
          proceeds from public follow-on public offering, net of offering expenses
                           
          proceeds from issuances of common stock pursuant to private placement with pfizer
                           
          proceeds from exercises of stock options
                           
          proceeds from issuances of common stock related to our atm, net of offering expenses
                           
          offering costs included in accrued expenses
                  -47,000 44,000 116,000       
          proceeds from issuance of common stock pursuant to private placement with pfizer
                           
          proceeds from purchases of common stock under espp
                           
          proceeds from issuance of common stock related to our atm, net of offering expenses
                           
          proceeds from purchases of common stock under employee stock purchase plan
                667,000           
          proceeds from issuance of common stock related to our at-the-market equity offering program, net of offering expenses
                11,329,000           
          other liabilities
                     -7,000 -8,000 -140,000 -8,000 
          proceeds from issuance of common stock in a private placement with pfizer
                 -160,000         
          proceeds from exercise of stock options and purchases of common stock under employee stock purchase plan
                 70,000 753,000 236,000 519,000 127,000 654,000 362,000 990,000   
          proceeds from issuance of common stock related to at-the-market offering, net of offering expenses
                 -1,000 -115,000 1,123,000       
          right-of-use-assets obtained in exchange for new operating lease liabilities
                         
          (accretion of discounts) and amortization of premiums on investments
                  -2,444,000         
          total cash, cash equivalents, and restricted cash
                  37,864,000 13,450,000 52,790,000  -30,061,000     
          acquired in-process research and development accrued
                           
          amortization of investment premiums
                    -1,494,000  -343,000 122,000 327,000   
          loss on disposal of property and equipment
                           
          extinguishment of ppp loan and accrued interest
                           
          amortization of premiums on marketable securities
                           
          deferred rent and lease incentive liability
                         264,000 171,000 
          maturities of marketable securities
                     89,738,000 64,121,000 59,709,000 39,300,000   
          proceeds from initial public offering of common stock, net of offering costs
                          
          proceeds from issuance of series c convertible preferred stock, net of issuance costs
                          
          repayment of promissory note
                         
          payments on capital lease
                          
          purchases of property and equipment unpaid at period end
                           
          conversion of convertible preferred stock to common stock at closing of initial public offering
                          
          extinguishment of ppp loan
                          
          acquisition of property and equipment included in accrued expenses and other current liabilities
                      50,000     
          payment of deferred issuance costs
                           
          deferred issuance costs related to initial public offering unpaid at period end
                           
          interest expense
                           
          initial fair value of mskcc success payments liability
                           
          proceeds from sale of equity securities
                           
          proceeds from ppp loan
                           
          capital lease financing for purchase of assets
                           
          issuance of common stock to acquire in-process research and development
                           
          non-cash consideration in exchange for licensing and collaboration revenue
                           
          payments to acquire in-process research & development
                           
          issuance of series c convertible preferred stock
                           
          proceeds from common stock options exercised
                           
          principal payments for capital lease
                           
          purchases of property and equipment accrued
                           
          deferred issuance costs related to initial public offering accrued