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Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 120,542 $ 117,358
Marketable securities 193,759 188,451
Restricted cash - current   10
Receivable from collaboration partner and contract asset - related party 2,638 2,426
Research and development tax incentive receivable 1,871 1,084
Prepaid expenses and other current assets 8,877 6,277
Total current assets 327,687 315,606
Marketable securities - noncurrent 38,169 2,000
Property and equipment, net 1,723 1,462
Restricted cash - noncurrent 225 450
Operating lease right-of-use asset 5,371 4,950
Total assets 373,175 324,468
Current liabilities:    
Accounts payable 706 3,075
Payable to collaboration partner - related party 1,121 2,732
Accrued expenses and other payables 33,061 18,498
Deferred revenue - related party 2,241 14,477
Operating lease liability - current 2,027 1,459
Total current liabilities 39,156 40,241
Operating lease liability - noncurrent 4,238 4,500
Other liabilities 121 121
Total liabilities 43,515 44,862
Commitments and contingencies
Stockholders' equity:    
Preferred stock, $0.00001 par value, 10,000,000 shares authorized; no shares issued and outstanding
Common stock, $0.00001 par value, 90,000,000 shares authorized; 47,671,654 and 43,745,465 shares issued and outstanding as of September 30, 2021 and December 31, 2020, respectively
Additional paid-in capital 702,319 563,389
Accumulated other comprehensive (loss) gain (204) 28
Accumulated deficit (372,455) (283,811)
Total stockholders' equity 329,660 279,606
Total liabilities and stockholders' equity $ 373,175 $ 324,468