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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Operating activities:    
Net loss $ (18,281) $ (18,292)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 1,338 879
Depreciation and amortization 39 57
Non-cash interest expense 1 3
Amortization of debt issuance costs 0 1
Amortization of operating lease right-of-use assets 258 206
Changes in assets and liabilities:    
Accounts receivable (3,427) 11,164
Prepaid expenses, other current assets, and other assets (1,120) 461
Accounts payable and accrued liabilities 657 (253)
Accrued compensation and benefits (1,953) 1,451
Deferred revenue (844) 2,753
Operating lease liabilities (276) (223)
Net cash used in operating activities (23,608) (1,793)
Investing activities:    
Purchases of property and equipment (84) (12)
Net cash used in investing activities (84) (12)
Financing activities:    
Proceeds from public offering of common stock, net of issuance costs 500 8,755
Proceeds from exercise of stock options 0 1
Principal repayments of Term Loan (1,111) (1,111)
Net cash (used in) provided by financing activities (611) 7,645
Net (decrease) increase in cash, cash equivalents, and restricted cash (24,303) 5,840
Cash, cash equivalents, and restricted cash at beginning of period 62,273 42,949
Cash, cash equivalents, and restricted cash at end of period 37,970 48,789
Supplemental disclosure of cash flows:    
Interest paid 25 75
Non-cash financing activities:    
Purchases of property and equipment included in accounts payable and accrued liabilities $ 16 $ 0