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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Cash flows from operating activities      
Net loss $ (6,542) $ (10,904)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Stock-based compensation 6,663 7,030  
Depreciation and amortization 1,278 1,089  
Accounts receivable credit losses 91 82 $ 470
Amortization of discount and premium on marketable securities (916) (1,561)  
Inventory reserve 394 0  
Amortization of debt issuance costs 29 42  
Loss on disposal of property and equipment 287 388  
Changes in operating assets and liabilities:      
Accounts receivable 552 (196)  
Inventory (3,767) (772)  
Prepaid expenses and other assets 494 524  
Accounts payable 952 2,371  
Accrued liabilities and other (4,426) (5,664)  
Net cash used in operating activities (4,911) (7,571)  
Cash flows from investing activities      
Maturities of marketable securities 60,000 67,000  
Purchases of marketable securities (47,298) (58,571)  
Purchases of property and equipment (2,072) (2,082)  
Net cash provided by investing activities 10,630 6,347  
Cash flows from financing activities      
Proceeds from the exercise of stock options 103 105  
Net cash provided by financing activities 103 105  
Effect of exchange rate changes on cash and cash equivalents 417 (112)  
Net increase (decrease) in cash and cash equivalents 6,239 (1,231)  
Cash and cash equivalents at      
Beginning of period 34,948 33,271 33,271
End of period 41,187 32,040 $ 34,948
Supplemental disclosure of non-cash information      
Unpaid purchases of property and equipment $ 815 $ 1,228