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Condensed consolidated statements of cash flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash flows from operating activities:    
Net loss $ (11,263) $ (13,322)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 847 806
Loss on fixed asset impairment 19 0
Stock-based compensation expense 1,042 1,085
Provision for excess and obsolete inventory 235 85
Noncash lease expense 305 305
Accretion on investments 32 (500)
Other 9 8
Changes in operating assets and liabilities:    
Accounts receivable 2,998 611
Inventory (1,075) (543)
Prepaid expenses and other current assets 196 (415)
Accounts payable 100 (809)
Accrued expenses and other current liabilities (2,003) (3,095)
Deferred revenue (507) 259
Net cash used in operating activities (9,065) (15,525)
Cash flows from investing activities:    
Purchases of property and equipment (319) (585)
Purchases of investments 0 (4,380)
Maturity of investments 11,000 18,480
Net cash provided by investing activities 10,681 13,515
Cash flows from financing activities:    
Proceeds from issuance of Class A common stock - stock option exercise 296 0
Proceeds from issuance of Class A common stock - employee stock purchase plan 90 168
Payments on finance lease obligations (7) (10)
Net cash provided by financing activities 379 158
Net decrease in cash, cash equivalents and restricted cash 1,995 (1,852)
Cash, cash equivalents and restricted cash at beginning of period 17,276 24,569
Cash, cash equivalents and restricted cash at end of period 19,271 22,717
Supplemental disclosure of cash flow information    
Cash paid for interest 12 9
Supplemental disclosure of non-cash investing activities    
Purchases of property and equipment in accounts payable and accrued expenses $ 106 $ 348