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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Current assets:    
Cash and cash equivalents $ 160,358 $ 36,308
Marketable securities 180,673 121,140
Accounts receivable   25,000
Prepaid expenses and other current assets 3,373 2,719
Total current assets 344,404 185,167
Property and equipment, net 8,121 4,171
Operating lease right-of-use asset 32,261 4,447
Restricted cash 2,498 2,498
Other long-term assets 1,021 98
Total assets 388,305 196,381
Current liabilities:    
Accounts payable 3,409 1,130
Accrued expenses 14,958 9,610
Operating lease liability 5,366 1,135
Deferred revenue 18,816 20,923
Other current liabilities 15 16
Total current liabilities 42,564 32,814
Long-term portion of operating lease liability 27,093 4,168
Long-term debt 24,680  
Other long-term liabilities 5 9
Long-term portion of deferred revenue 33,193 46,489
Total liabilities 127,535 83,480
Commitments and contingencies (Note 11)
Stockholders' equity:    
Preferred stock, $0.001 par value; 10,000,000 shares authorized at December 31, 2020 and December 31, 2019; no shares issued and outstanding at December 31, 2020 and December 31, 2019
Common stock, $0.001 par value; 150,000,000 shares authorized and 34,152,470 shares issued and outstanding as of December 31, 2020; 150,000,000 shares authorized and 29,792,922 shares issued and outstanding as of December 31, 2019 34 30
Additional paid-in capital 505,069 270,682
Accumulated other comprehensive income (loss) (2) 37
Accumulated deficit (244,331) (157,848)
Total stockholders' equity 260,770 112,901
Total liabilities and stockholders' equity $ 388,305 $ 196,381