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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net (loss) income $ (16,533) $ 9,733
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:    
Depreciation and amortization 1,105 751
Stock-based compensation 2,508 1,008
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (285) 606
Accounts payable (1,884) 402
Accrued liabilities (332) (812)
Deferred rent 1,510 96
Deferred revenue   (22,378)
Net cash used in operating activities (13,911) (10,594)
Cash flows from investing activities:    
Maturities of marketable securities 56,786 30,349
Purchase of marketable securities (38,420) (23,531)
Purchase of property and equipment (766) (1,445)
Net cash provided by investing activities 17,600 5,373
Cash flows from financing activities:    
Proceeds from issuances of common stock 63 37
Payments of the term loan (417) (277)
Net cash used in financing activities (354) (240)
Net increase (decrease) in cash, cash equivalents and restricted cash 3,335 (5,461)
Cash, cash equivalents and restricted cash—beginning of period 36,284 39,130
Cash, cash equivalents and restricted cash—end of period 39,619 33,669
Supplemental disclosures of cash flow information:    
Cash paid for interest $ 36 35
Supplemental disclosures of noncash investing and financing activities:    
Purchase of property and equipment included in accrued liabilities   $ 156