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Condensed Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities    
Net loss $ (19,499) $ (24,151)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation expense 4,780 4,091
Depreciation 96 153
Amortization of debt discount and issuance costs 133 128
Non-cash interest expense 494 411
PIK interest incurred but not paid on term loan 1,314 632
Amortization of right-of-use asset 702 1,343
Loss on short-term investments 695 109
Inventory write-downs 88 169
Changes in operating assets and liabilities    
Accounts receivable (3,395) (1,384)
Inventory (389) (766)
Prepaid expenses and other assets 1,061 (841)
Accounts payable (215) 93
Accrued liabilities 769 (468)
Operating lease liabilities (692) (1,570)
Net cash (used in) operating activities (14,058) (22,051)
Cash flows from investing activities    
Acquisition of property and equipment (132) (470)
Proceeds from sale of short-term investments 15,500 8,400
Net cash provided by investing activities 15,368 7,930
Cash flows from financing activities    
Proceeds from issuance of common stock under employee plans 246 683
Taxes withheld and paid related to net share settlement of equity awards (187) (47)
Payment of deferred offering costs (119) 0
Net cash (used in) provided by financing activities (60) 636
Net increase (decrease) in cash and cash equivalents 1,250 (13,485)
Cash, cash equivalents and restricted cash    
Beginning of the period 6,727 19,309
End of the period 7,977 5,824
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:    
Cash and cash equivalents 7,855 5,702
Restricted cash 122 122
Cash, cash equivalents and restricted cash in balance sheets 7,977 5,824
Supplemental disclosure of cash flow information:    
Cash paid for interest 2,148 2,510
Supplemental disclosures of non-cash investing and financing information:    
Net change in accrued liabilities from early exercise of options (1) (3)
Purchase of property and equipment included in accounts payable $ 0 $ 31