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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)

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