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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (26,746) $ (3,161)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 546 335
Amortization of right-of-use asset 325 356
Equity-based compensation 1,281 985
Amortization of long-term debt issuance costs and fees 141 35
Amortization of investments 171 95
Other 6 0
Change in fair value of warrant liabilities (15) (157)
Changes in operating assets and liabilities:    
Accounts receivable 11 11
Prepaid expenses and other current assets (357) (1,646)
Other noncurrent assets (44) (1,034)
Accounts payable 415 22
Accrued expenses (280) (647)
Deferred revenue (1,076) (13,949)
Other liabilities (263) (59)
Net cash used in operating activities (25,885) (18,814)
Cash flows from investing activities:    
Purchase of available for sale securities (2,000) (38,072)
Proceeds from sale or maturity of available for sale securities 37,097 32,103
Capital expenditures (564) (2,996)
Net cash provided by (used in) investing activities 34,533 (8,965)
Cash flows from financing activities:    
Proceeds from common stock offering 0 2,973
Payment of common stock financing costs 0 (207)
Payment of long-term debt fees and issuance costs 0 (100)
Repayment of long-term debt 0 (4,999)
Proceeds from issuance of employee stock purchase plan 131 0
Proceeds from exercise of common stock options 546 50
Net cash provided by (used in) financing activities 677 (2,283)
Net increase (decrease) in cash, cash equivalents, and restricted cash 9,325 (30,062)
Cash, cash equivalents, and restricted cash - beginning of period 34,462 48,460
Cash, cash equivalents, and restricted cash - end of period 43,787 18,398
Non-cash investing activities:    
Capital expenditures (accounts payable and accrued expenses) $ 11 $ 60