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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from operating activities: |  |  |
Net loss | $ (105,897) | $ (87,154) | $ (59,853)
Adjustments to reconcile net loss to cash used in operating activities: |  |  |
Depreciation and amortization | 3,807 | 2,841 | 3,324
Stock-based compensation expense | 19,134 | 10,337 | 3,796
Change in fair value in derivative liability and redeemable convertible preferred stock warrants | 107 | 283 | (199)
Non-cash lease adjustment | 13 | 1,478 | (345)
Inventory write-down | 995 | 62 | 650
Loss on loan extinguishment | 0 | 3,258 | 0
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net | (33,103) | (10,809) | (2,914)
Inventory | (9,751) | (15,251) | (6,124)
Prepaid expenses and other current assets | 1,051 | (1,880) | (2,631)
Other assets | (868) | (51) | 0
Accounts payable | 5,789 | 3,959 | 812
Accrued compensation | 3,438 | 6,972 | 1,834
Accrued interest expense | 125 | 757 | 1,045
Deferred revenue | 3,317 | 1,830 | 792
Operating lease liabilities | 4,989 | 327 | 0
Other liabilities | (1,149) | 2,659 | 2,479
Net cash used in operating activities | (108,003) | (80,382) | (57,334)
Cash flows from investing activities: |  |  |
Purchases of property and equipment | (25,206) | (2,653) | (592)
Net cash used in investing activities | (25,206) | (2,653) | (592)
Cash flows from financing activities: |  |  |
Proceeds from issuance of common stock under employee stock purchase plan | 3,610 | 2,409 | 0
Proceeds from issuance of common stock from the exercise of stock options | 2,480 | 4,008 | 4,184
Proceeds from issuance of common stock from the initial public offering, net of underwriting discounts, commissions and offering expenses | 0 | 0 | 172,364
Proceeds from issuance of common stock, net of issuance costs | 161,705 | 0 | 0
Proceeds from the exercise of redeemable convertible preferred stock warrants | 0 | 0 | 858
Proceeds from issuance of long-term debt, net of issuance costs | 0 | 51,195 | 0
Payment of principal on long-term debt | 0 | (50,000) | 0
Payment of final payment fee | 0 | (3,000) | 0
Payment of prepayment fee | 0 | (1,000) | 0
Net cash provided by financing activities | 167,795 | 3,612 | 262,116
Net increase (decrease) in cash, cash equivalents and restricted cash | 34,586 | (79,423) | 204,190
Beginning of the period | 225,674 | 305,097 | 100,907
End of the period | 260,260 | 225,674 | 305,097
Reconciliation of cash, cash equivalents and restricted cash to balance sheets: |  |  |
Cash and cash equivalents | 257,222 | 221,859 | 304,320
Restricted cash | 3,038 | 3,815 | 777
Cash, cash equivalents and restricted cash in balance sheets | 260,260 | 225,674 | 305,097
Supplemental cash flow information |  |  |
Interest paid | 4,056 | 4,291 | 4,750
Non-cash investing and financing activities |  |  |
Transfer of evaluation units from inventory to property and equipment, net | 347 | 124 | (679)
Property and equipment included in accounts payable and accrued expenses | 1,863 | 3,544 | 210
Right-of-use assets obtained in exchange for operating lease liabilities | 0 | 22,854 | 0
Conversion of redeemable convertible preferred stock to common stock | 0 | 0 | 329,534
Series G |  |  |
Cash flows from financing activities: |  |  |
Proceeds from issuance of Series G redeemable convertible preferred stock, net of issuance costs | $ 0 | $ 0 | $ 84,710

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