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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Current Assets:    
Cash and cash equivalents $ 160,020 $ 57,226
Marketable securities 437,351 222,500
Accounts receivable 2,130 4,620
Prepaid expenses and other current assets 17,016 5,135
Total current assets 616,517 289,481
Marketable securities - noncurrent   4,746
Property and equipment, net 15,943 17,996
Operating lease right-of-use assets 39,114 19,137
Other assets 4,748 2,920
Total Assets 676,322 334,280
Current Liabilities:    
Accounts payable 10,460 3,941
Accrued expenses 25,554 13,273
Current portion of operating lease liability 5,696 5,745
Current portion of deferred revenue 22,544 12,674
Total current liabilities 64,254 35,633
Deferred revenue, net of current portion 51,387 16,136
Long-term operating lease liability 33,609 12,630
Commitments and contingencies (Note 8)
Stockholders’ Equity:    
Common stock, $0.0001 par value; 120,000,000 shares authorized; 66,234,056 and 50,198,044 shares issued and outstanding at December 31, 2020 and 2019, respectively 7 5
Additional paid-in capital 962,173 570,493
Accumulated other comprehensive income 1 261
Accumulated deficit (435,109) (300,878)
Total stockholders’ equity 527,072 269,881
Total Liabilities and Stockholders’ Equity $ 676,322 $ 334,280