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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

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