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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Current assets:    
Cash and cash equivalents $ 169,401 $ 203,519
Marketable securities 283,157 296,326
Accounts receivable 713 267
Prepaid expenses and other current assets 8,106 7,198
Total current assets 461,377 507,310
Marketable securities 75,062 120,071
Property and equipment, net 16,198 17,118
Right-of-use assets 20,666 26,173
Restricted cash and other non-current assets 7,530 6,811
Total assets 580,833 677,483
Current liabilities:    
Accounts payable 6,169 5,050
Accrued expenses 20,105 20,192
Deferred revenue, current   11,333
Operating lease liabilities 10,147 10,309
Total current liabilities 36,421 46,884
Operating lease liabilities, net of current portion 10,110 16,069
Deferred revenue, net of current portion 68,888 60,888
Total liabilities 115,419 123,841
Stockholders' equity    
Preferred stock, $0.0001 par value per share: 5,000,000 shares authorized; no shares issued or outstanding
Common stock, $0.0001 par value per share: 195,000,000 shares authorized; 68,736,434 and 68,489,257 shares issued, and 68,718,434 and 68,435,257 shares outstanding at June 30, 2022 and December 31, 2021, respectively 7 7
Additional paid-in capital 1,430,461 1,411,827
Accumulated other comprehensive loss (3,387) (493)
Accumulated deficit (961,667) (857,699)
Total stockholders' equity 465,414 553,642
Total liabilities and stockholders' equity $ 580,833 $ 677,483