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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net loss $ (32,036) $ (30,892)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 4,713 2,822
Depreciation of property and equipment 393 284
Loss on disposal of equipment 4 0
Amortization of deferred financing costs and loan discount 114 0
Changes in operating assets and liabilities:    
Accounts receivable (868) (2,737)
Inventory (3,930) (2,184)
Prepaid expenses and other current assets 902 (479)
Accounts payable (586) 766
Accrued expenses 112 584
Net cash used in operating activities (31,182) (31,836)
Cash flows from investing activities:    
Purchase of property and equipment (422) (606)
Net cash used in investing activities (422) (606)
Cash flows from financing activities:    
Proceeds from the exercise of common stock options 519 81
Proceeds from Employee Stock Purchase Plan 452 295
Proceeds from debt financing 7,500 0
Debt financing costs (67) 0
Net cash provided by financing activities 8,404 376
Effect of currency exchange on cash and cash equivalents (1) (21)
Net change in cash and cash equivalents (23,201) (32,087)
Cash and cash equivalents at beginning of period 106,194 142,072
Cash and cash equivalents at end of period 82,993 109,985
Supplemental Information:    
Cash paid for interest 979 0
Cash paid for income taxes $ 4 $ 4