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Condensed Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities    
Net loss $ (10,375) $ (11,461)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation expense 2,125 1,488
Depreciation 48 80
Amortization of debt discount and issuance costs 64 67
Non-cash interest expense 234 201
PIK interest incurred but not paid on term loan 649 0
Amortization of right-of-use asset 347 672
Loss on short-term investments 817 0
Inventory write-downs 34 82
Changes in operating assets and liabilities    
Accounts receivable (1,713) (1,970)
Inventory (1,072) (362)
Prepaid expenses and other assets 514 239
Accounts payable (193) 820
Accrued liabilities (834) (472)
Operating lease liabilities (343) (777)
Net cash (used in) operating activities (9,698) (11,393)
Cash flows from investing activities    
Acquisition of property and equipment (132) (306)
Proceeds from sale of short-term investments 10,200 0
Net cash provided by (used in) investing activities 10,068 (306)
Cash flows from financing activities    
Proceeds from issuance of common stock under employee plans 1 1
Taxes withheld and paid related to net share settlement of equity awards (146) 0
Payment of deferred offering costs (110) 0
Net cash (used in) provided by financing activities (255) 1
Net increase (decrease) in cash and cash equivalents 115 (11,698)
Cash, cash equivalents and restricted cash    
Beginning of the period 6,727 19,309
End of the period 6,842 7,611
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:    
Cash and cash equivalents 6,720 7,489
Restricted cash 122 122
Cash, cash equivalents and restricted cash in balance sheets 6,842 7,611
Supplemental disclosure of cash flow information:    
Cash paid for interest 1,018 1,563
Supplemental disclosures of non-cash investing and financing information:    
Net change in accrued liabilities from early exercise of options 0 (2)
Purchase of property and equipment included in accounts payable $ 0 $ 31