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Unaudited Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:    
Net loss $ (33,033) $ (19,798)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,037 656
Amortization of debt discount and debt issuance costs 119 226
Non-cash interest expense 411 403
Non-cash lease expense 738 0
Stock-based compensation 4,122 3,551
Other 33 0
Changes in assets and liabilities:    
Accounts receivable, net (985) (300)
Prepaid expenses and other current assets 921 1,754
Other assets (100) (167)
Operating lease liabilities (613) 0
Accounts payable 1,061 (1,085)
Accrued and other current liabilities (121) 538
Net cash used in operating activities (26,410) (14,222)
Cash flows from investing activities:    
Purchases of property and equipment (3,912) (1,306)
Purchase of other assets 0 (50)
Net cash used in investing activities (3,912) (1,356)
Cash flows from financing activities:    
Proceeds from exercise of stock options 0 80
Payments of taxes withheld on vested restricted stock units (224) 0
Proceeds from common stock issued under Employee Stock Purchase Plan 385 390
Proceeds from exercise of common stock warrants 0 32
Principal payments on finance lease obligations (477) (343)
Proceeds from the issuance of common stock in public offering 0 69,144
Payment of issuance costs related to public offering 0 (4,407)
Net cash (used in) provided by financing activities (316) 64,896
Net change in cash, cash equivalents and restricted cash (30,638) 49,318
Cash, cash equivalents and restricted cash, beginning of period 99,542 57,548
Cash, cash equivalents and restricted cash, end of period 68,904 106,866
Supplemental disclosure of cash flow information:    
Cash paid for interest 1,297 1,362
Supplemental disclosure of non-cash items:    
Equipment purchased under finance lease obligations 709 1,111
Costs incurred, but not paid, in connection with capital expenditures 645 135
Deferred offering costs reclassified to equity $ 0 $ 28