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Condensed Consolidated Balance Sheets (unaudited) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 87,248 $ 282,689
Short-term marketable securities 425,433 350,365
Income tax receivable 14,066 15,273
Prepaid expenses and other current assets 8,139 6,120
Total current assets 534,886 654,447
Property and equipment, net 14,741 1,520
Long-term marketable securities 19,088 12,534
Operating lease right-of-use asset 20,569  
Other assets 12,941 12,470
Total assets 602,225 680,971
Current liabilities:    
Accounts payable 4,595 4,295
Accrued expenses and other current liabilities 23,453 27,104
Operating lease liability 4,541  
Income tax payable 45 301
Total current liabilities 32,634 31,700
Operating lease liability, noncurrent 26,760  
Deferred rent, noncurrent   1,027
Total liabilities 59,394 32,727
Commitments and contingencies (Note 9)
Stockholders’ equity:    
Common stock, $0.001 par value; 150,000,000 shares authorized at September 30, 2021 and December 31, 2020; 47,399,873 and 47,300,231 shares issued at September 30, 2021 and December 31, 2020, respectively; 47,378,041 and 47,248,685 shares outstanding at September 30, 2021 and December 31, 2020, respectively 47 47
Preferred stock, $0.001 par value; 10,000,000 shares authorized and no issued or outstanding at September 30, 2021 and December 31, 2020  
Additional paid-in capital 723,033 705,607
Accumulated deficit (180,249) (57,410)
Total stockholders’ equity 542,831 648,244
Total liabilities and stockholders’ equity $ 602,225 $ 680,971