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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Current assets:    
Cash and cash equivalents $ 117,358 $ 33,006
Marketable securities 188,451 100,011
Restricted cash - current 10 10
Receivable from collaboration partner and contract asset - related party 2,426 6,755
Research and development tax incentive receivable 1,084  
Prepaid expenses and other current assets 6,277 5,529
Total current assets 315,606 145,311
Marketable securities - noncurrent 2,000  
Property and equipment, net 1,462 1,681
Restricted cash - noncurrent 450 450
Operating lease right-of-use asset 4,950 6,042
Deferred tax asset   1,433
Total assets 324,468 154,917
Current liabilities:    
Accounts payable 3,075 2,790
Payable to collaboration partner - related party 2,732 1,262
Accrued expenses and other payables 18,498 12,360
Deferred revenue - related party - current 14,477 17,738
Operating lease liability - current 1,459 1,256
Total current liabilities 40,241 35,406
Long-term debt, net   9,794
Deferred revenue - related party - noncurrent   23,792
Operating lease liability - noncurrent 4,500 5,961
Other liabilities 121  
Total liabilities 44,862 74,953
Commitments and contingencies (Note 11)
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; 43,745,465 and 27,217,649 shares issued and outstanding as of December 31, 2020 and December 31, 2019, respectively
Additional paid-in capital 563,389 297,846
Accumulated other comprehensive gain (loss) 28 (221)
Accumulated deficit (283,811) (217,661)
Total stockholders' equity 279,606 79,964
Total liabilities and stockholders' equity $ 324,468 $ 154,917