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Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Cash flows from operating activities |  |
Net loss | $ (32,956) | $ (47,082)
Adjustments to reconcile net loss to net cash used in operating activities |  |
Stock-based compensation expense | 9,558 | 8,349
Depreciation | 172 | 267
Amortization of debt discount and issuance costs | 283 | 258
Non-cash interest expense | 1,075 | 874
PIK interest incurred but not paid on term loan | 2,683 | 1,934
Amortization of right-of-use asset | 1,433 | 2,720
Loss on short-term investments | 315 | 356
Inventory write-downs | 196 | 243
Other | 24 | 0
Changes in operating assets and liabilities |  |
Accounts receivable | (4,850) | (391)
Inventory | (1,698) | (2,133)
Prepaid expenses and other assets | 381 | (792)
Accounts payable | 240 | 647
Accrued liabilities | 3,768 | (15)
Deferred revenue | 1,090 | 0
Operating lease liabilities | (1,415) | (2,104)
Net cash used in operating activities | (19,701) | (36,869)
Cash flows from investing activities |  |
Acquisition of property and equipment | (173) | (603)
Proceeds from sale of short-term investments | 23,200 | 24,400
Net cash provided by investing activities | 23,027 | 23,797
Cash flows from financing activities |  |
Proceeds from issuance of common stock under employee plans | 803 | 896
Taxes withheld and paid related to net share settlement of equity awards | (259) | (59)
Proceeds from at-the-market offering, net of issuance costs | 7,888 | 0
Payment of deferred offering costs | (305) | (347)
Net cash provided by financing activities | 8,127 | 490
Net increase (decrease) in cash and cash equivalents | 11,453 | (12,582)
Cash, cash equivalents and restricted cash |  |
Beginning of year | 6,727 | 19,309
End of year | 18,180 | 6,727
Reconciliation of cash, cash equivalents and restricted cash to balance sheets: |  |
Cash and cash equivalents | 18,058 | 6,605
Restricted cash | 122 | 122
Total cash, cash equivalents and restricted cash | 18,180 | 6,727
Supplemental disclosure of cash flow information: |  |
Cash paid for interest | 4,476 | 4,464
Supplemental disclosures of non-cash investing and financing information: |  |
Operating lease right-of-use asset obtained in exchange for lease obligations | 0 | 10,700
Net change in accrued liabilities from early exercise of options | (1) | (4)
Purchase of property and equipment included in accounts payable | 69 | 124
Deferred offering costs offset against additional paid-in capital | $ 265 | $ 0

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