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Condensed Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2025
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Cash flows from operating activities                
Net loss   $ (3,496) $ (6,589) $ (5,452) $ (8,925) $ (18,736) $ (21,891)  
Adjustments to reconcile net loss to net cash used in operating activities                
Stock-based compensation expense           8,482 7,679  
Depreciation   100   100   158 159  
Amortization of debt discount and issuance costs           174 179  
Non-cash interest expense           463 743  
Loss on debt extinguishment           527 0  
PIK interest incurred but not paid on term loan           0 1,389  
Amortization of right-of-use asset           1,268 1,159  
Gain on short-term investments           (41) (315)  
Inventory write-downs           140 196  
Loss on disposal of property and equipment           2 0  
Changes in operating assets and liabilities                
Accounts receivable           (2,087) 753  
Inventory           (4,894) (1,066)  
Prepaid expenses and other assets           134 621  
Accounts payable           1,655 (102)  
Accrued liabilities           2,530 (1,108)  
Deferred revenue           93 (341)  
Operating lease liabilities           (1,380) (1,207)  
Net cash used in operating activities           (11,512) (13,152)  
Cash flows from investing activities                
Acquisition of property and equipment           (235) (267)  
Proceeds from sale of short-term investments           0 7,300  
Net cash (used in) provided by investing activities           (235) 7,033  
Cash flows from financing activities                
Repurchase of common stock           (49,546) 0  
Proceeds from issuance of common stock under employee plans           1,152 1,336  
Taxes withheld and paid related to net share settlement of equity awards           (455) (789)  
Net cash provided by financing activities           18,965 3,479  
Net increase (decrease) in cash and cash equivalents           7,218 (2,640)  
Cash, cash equivalents and restricted cash                
Beginning of the period $ 13,552   $ 13,552   $ 18,180 13,552 18,180 $ 18,180
End of the period   20,770   15,540   20,770 15,540 13,552
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:                
Cash and cash equivalents   20,648   15,418   20,648 15,418 13,430
Restricted cash   122   122   122 122 122
Cash, cash equivalents and restricted cash in balance sheets   $ 20,770   $ 15,540   20,770 15,540 13,552
Supplemental disclosure of cash flow information:                
Cash paid for interest           4,735 4,294  
Supplemental disclosures of non-cash investing and financing information:                
Deferred offering costs offset against additional paid-in capital           277 99  
Purchase of property and equipment included in accounts payable           1 0  
Net change in accrued liabilities from early exercise of options           0 (1)  
Follow-on Offering                
Cash flows from financing activities                
Proceeds from issuance of stock           69,654 0  
At-the-Market Equity Offering                
Cash flows from financing activities                
Proceeds from issuance of stock $ 200         232 2,932 $ 3,400
Proceeds from debt, net of discounts and issuance costs           58,435 0  
Repayment of debt           $ (60,507) $ 0