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Unaudited Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net loss $ (19,798) $ (13,234)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 656 392
Amortization of debt discount and debt issuance costs 226 202
Non-cash interest expense 403 397
Deferred income taxes 0 (117)
Stock-based compensation 3,551 1,877
Changes in assets and liabilities:    
Accounts receivable, net (300) (3,582)
Prepaid expenses and other current assets 1,754 1,627
Other assets (167) 0
Accounts payable (1,085) 781
Accrued and other current liabilities 538 1,472
Net cash used in operating activities (14,222) (10,185)
Cash flows from investing activities:    
Purchases of property and equipment (1,306) (450)
Purchase of other assets (50) 0
Net cash used in investing activities (1,356) (450)
Cash flows from financing activities:    
Proceeds from exercise of stock options 80 12
Proceeds from common stock issued under Employee Stock Purchase Plan 390 142
Proceeds from exercise of common stock warrants 32 18
Principal payment on capital lease obligations (343) (187)
Proceeds from Paycheck Protection Program loan 0 2,865
Repayment of Paycheck Protection Program loan 0 (2,865)
Proceeds from the issuance of common stock in public offering, gross 69,144 0
Payment of issuance costs related to public offering (4,407) 0
Net cash provided by (used in) financing activities 64,896 (15)
Net change in cash, cash equivalents and restricted cash 49,318 (10,650)
Cash, cash equivalents and restricted cash, beginning of period 57,548 72,184
Cash, cash equivalents and restricted cash, end of period 106,866 61,534
Supplemental disclosure of cash flow information:    
Cash paid for interest expense 1,362 1,312
Supplemental disclosure of non-cash items:    
Equipment purchased under capital lease obligations 1,111 123
Costs incurred, but not paid, in connection with capital expenditures 135 197
Deferred offering costs reclassified to equity $ 28 $ 0