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Condensed Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities    
Net loss $ (16,439) $ (19,499)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation expense 5,088 4,780
Depreciation 103 96
Amortization of debt discount and issuance costs 132 133
Non-cash interest expense 540 494
PIK interest incurred but not paid on term loan 1,389 1,314
Amortization of right-of-use asset 764 702
(Gain) loss on short-term investments (96) 695
Inventory write-downs 89 88
Changes in operating assets and liabilities    
Accounts receivable 1,071 (3,395)
Inventory (238) (389)
Prepaid expenses and other assets 653 1,061
Accounts payable 28 (215)
Accrued liabilities (3,436) 769
Deferred revenue (280) 0
Operating lease liabilities (796) (692)
Net cash used in operating activities (11,428) (14,058)
Cash flows from investing activities    
Acquisition of property and equipment (167) (132)
Proceeds from sale of short-term investments 5,800 15,500
Net cash provided by investing activities 5,633 15,368
Cash flows from financing activities    
Proceeds from issuance of common stock under employee plans 1,302 246
Taxes withheld and paid related to net share settlement of equity awards (721) (187)
Payment of deferred offering costs 0 (119)
Net cash provided by (used in) financing activities 581 (60)
Net (decrease) increase in cash and cash equivalents (5,214) 1,250
Cash, cash equivalents and restricted cash    
Beginning of the period 18,180 6,727
End of the period 12,966 7,977
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:    
Cash and cash equivalents 12,844 7,855
Restricted cash 122 122
Cash, cash equivalents and restricted cash in balance sheets 12,966 7,977
Supplemental disclosure of cash flow information:    
Cash paid for interest 2,362 2,148
Supplemental disclosures of non-cash investing and financing information:    
Net change in accrued liabilities from early exercise of options $ (1) $ (1)