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Condensed consolidated statements of cash flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities:    
Net loss $ (27,198) $ (23,121)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 1,380 1,658
Amortization of debt discount and issuance costs 171 0
Stock-based compensation expense 2,544 2,260
Provision for excess and obsolete inventory 10 441
Non-cash lease expense 609 609
Gain on revaluation of warrant liability (118) 0
Accretion on investments 187 149
Other 115 36
Changes in operating assets and liabilities:    
Accounts receivable (2,381) 1,471
Inventory (1,688) (1,119)
Prepaid expenses and other current assets 82 182
Other long-term assets 3 0
Accounts payable 938 800
Accrued expenses and other current liabilities (3,187) (1,668)
Deferred revenue 773 (463)
Net cash used in operating activities (27,760) (18,765)
Cash flows from investing activities:    
Purchases of property and equipment (171) (685)
Purchases of investments (5,020) (2,290)
Sales of investments 5,008 0
Maturity of investments 13,000 23,000
Net cash provided by investing activities 12,817 20,025
Cash flows from financing activities:    
Proceeds from issuance of Class A common stock - stock option exercise 183 423
Proceeds from issuance of Class A common stock - employee stock purchase plan 140 90
Tax withholding on settlement of restricted stock units 0 (418)
Proceeds from related parties in underwritten and D&O offerings, net of underwriting discounts 9,395 0
Payments of third-party offering costs (100) 0
Payments on finance lease obligations (18) (14)
Net cash provided by financing activities 9,600 81
Net (decrease) increase in cash, cash equivalents and restricted cash (5,343) 1,341
Cash, cash equivalents and restricted cash at beginning of period 20,314 17,276
Cash, cash equivalents and restricted cash at end of period 14,971 18,617
Supplemental disclosure of cash flow information    
Cash paid for interest 1,118 24
Supplemental disclosure of non-cash investing activities    
Purchases of property and equipment in accounts payable and accrued expenses 0 75
Supplemental disclosure of non-cash financing activities    
Offering costs included in accounts payable and accrued expenses $ 409 $ 0