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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net loss $ (50,277) $ (11,983)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 829 494
Amortization of right-of-use asset 489 518
Equity-based compensation 2,170 1,603
Amortization of long-term debt issuance costs and fees 213 39
Amortization of investments 183 202
Other 6 67
Change in fair value of warrant liabilities (15) (343)
Changes in operating assets and liabilities:    
Accounts receivable 11 (10)
Prepaid expenses and other current assets 922 (1,473)
Other noncurrent assets (72) (181)
Accounts payable 629 535
Accrued expenses 1,697 (461)
Deferred revenue 22,601 (16,351)
Other liabilities (408) (119)
Net cash used in operating activities (21,022) (27,463)
Cash flows from investing activities:    
Purchase of available for sale securities (6,497) (47,349)
Proceeds from sale or maturity of available for sale securities 46,097 47,093
Capital expenditures (623) (3,074)
Net cash provided by (used in) investing activities 38,977 (3,330)
Cash flows from financing activities:    
Proceeds from common stock offering 0 2,973
Payment of common stock financing costs 0 (207)
Proceeds from long-term borrowing 0 17,500
Payment of long-term debt fees and issuance costs 0 (344)
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 69
Payments for minimum statutory tax withholding related to net share settlement of equity awards (9) 0
Net cash provided by financing activities 668 14,992
Net increase (decrease) in cash, cash equivalents, and restricted cash 18,623 (15,801)
Cash, cash equivalents, and restricted cash - beginning of period 34,462 48,460
Cash, cash equivalents, and restricted cash - end of period 53,085 32,659
Supplemental disclosure of cash flow information:    
Right-of-use asset acquired through operating leases 0 8,147
Non-cash investing activities:    
Capital expenditures (accounts payable and accrued expenses) 303 13
Non-cash financing activities:    
Debt fees (accrued expense and other noncurrent liabilities) $ 0 $ 834