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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 392,072 $ 62,889
Marketable securities 33,121 199,438
Prepaid expenses and other current assets 7,548 5,408
Total current assets 432,741 267,735
Property and equipment, net 23,609 23,781
Operating lease right-of-use assets 31,988  
Restricted cash, noncurrent 2,051 2,051
Deferred offering costs   336
Other long-term assets 403 252
Total assets 490,792 294,155
Current liabilities:    
Accounts payable 589 267
Accrued expenses and other current liabilities 9,055 10,953
Operating lease liability 4,287  
Total current liabilities 13,931 11,220
Operating lease liability, net of current portion 43,459  
Deferred rent, net of current portion   14,922
Total liabilities 57,390 26,142
Commitments and contingencies (Note 9)
Stockholders' equity (deficit):    
Preferred stock, $0.0001 par value; 5,000,000 shares authorized and no shares issued or outstanding at June 30, 2021 and December 31, 2020
Common stock, $0.0001 par value; 150,000,000 shares authorized at June 30, 2021 and December 31, 2020; 56,732,310 and 46,970,012 shares issued at June 30, 2021 and December 31, 2020, respectively; 56,431,513 and 46,291,877 shares outstanding at June 30, 2021 and December 31, 2020, respectively 6 5
Additional paid-in capital 678,720 456,974
Accumulated other comprehensive income 4 9
Accumulated deficit (245,328) (188,975)
Total stockholders' equity (deficit) 433,402 268,013
Total liabilities, convertible preferred stock and stockholders' equity (deficit) $ 490,792 $ 294,155