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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:    
Net loss $ (41,199) $ (41,428)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 6,303 3,887
Depreciation of property and equipment 522 412
Loss on disposal of equipment 4 0
Amortization of deferred financing costs and loan discount 154 25
Changes in operating assets and liabilities:    
Accounts receivable (2,047) (2,944)
Inventory (4,026) (3,077)
Prepaid expenses and other current assets 1,273 (1,634)
Accounts payable 165 1,209
Accrued expenses (170) 873
Net cash used in operating activities (39,021) (42,677)
Cash flows from investing activities:    
Purchase of property and equipment (591) (685)
Net cash used in investing activities (591) (685)
Cash flows from financing activities:    
Proceeds from the exercise of common stock options 728 184
Proceeds from Employee Stock Purchase Plan 935 587
Proceeds from debt financing 22,500 7,500
Debt financing costs (179) (778)
Net cash provided by financing activities 23,984 7,493
Effect of currency exchange on cash and cash equivalents 3 (9)
Net change in cash and cash equivalents (15,625) (35,878)
Cash and cash equivalents at beginning of period 106,194 142,072
Cash and cash equivalents at end of period 90,569 106,194
Supplemental Information:    
Cash paid for interest 1,396 59
Cash paid for income taxes $ 4 $ 5