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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 394,553 $ 507,144
Short-term marketable securities 644,622 962,553
Cost sharing reimbursements due from related party 1,194 5,674
Prepaid expenses and other current assets 15,140 20,284
Total current assets 1,055,509 1,495,655
Long-term marketable securities 319,472 32,699
Property and equipment, net 40,012 40,846
Operating lease right-of-use asset 31,196 32,618
Other non-current assets 3,777 2,462
Total assets 1,449,966 1,604,280
Current liabilities:    
Accounts payable 4,817 1,071
Accrued compensation 10,534 20,503
Accrued manufacturing costs 13,142 7,140
Accrued clinical and other research & development costs 13,380 11,775
Other accrued costs and current liabilities 2,364 3,037
Operating lease liability, current 5,252 4,690
Related party contract liability, current 3,438 3,569
Contract liabilities, current 1,324 19,914
Total current liabilities 54,251 71,699
Related party contract liability, less current portion 291,434 293,849
Contract liabilities, less current portion 31,313 23,325
Operating lease liability, less current portion 59,990 64,175
Other non-current liabilities 701 701
Total liabilities 437,689 453,749
Commitments and contingencies (Note 7)
Stockholders' equity:    
Convertible preferred stock, $0.01 par value; 40,000,000 shares authorized as of September 30, 2021 and December 31, 2020; 0 shares issued and outstanding as of September 30, 2021 and December 31, 2020 0 0
Common stock, $0.01 par value; 400,000,000 shares authorized as of September 30, 2021 and December 31, 2020; 122,011,151 shares and 120,531,333 shares issued and outstanding as of September 30, 2021 and December 31, 2020, respectively 1,545 1,531
Additional paid-in capital 1,580,988 1,503,660
Accumulated other comprehensive loss (521) (245)
Accumulated deficit (569,735) (354,415)
Total stockholders' equity 1,012,277 1,150,531
Total liabilities and stockholders’ equity $ 1,449,966 $ 1,604,280