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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net Loss | $ (45,370) | $ (25,860) | $ (14,527)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 9,653 | 7,088 | 3,378
Amortization of debt issuance costs | 49 | 49 | 41
Stock-based compensation | 11,245 | 6,784 | 4,246
Warrant expense | 0 | 0 | (202)
Deferred taxes | 252 | (39) | 3,038
Change in fair value of preferred stock warrant liability | 10,624 | (749) | 1,329
Changes in assets and liabilities: |  |  |
Accounts receivable | (9,110) | (740) | (57)
Inventory | (48,476) | (13,867) | (10,827)
Prepaid expenses and other current assets | (11,505) | (11,249) | (4,746)
Accounts payable and accrued expenses | 25,240 | 1,249 | 16,162
Other long-term liabilities | 5,289 | 1,944 | 1,470
Deferred revenue | 1,259 | 812 | 737
Net cash (used in) provided by operating activities | (50,850) | (34,578) | 42
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchase of property and equipment | (24,181) | (14,350) | (13,122)
Investment in equity securities | (250) | (2,000) | 0
Changes in security deposits | (1,205) | 69 | (2,056)
Net cash used in investing activities | (25,636) | (16,281) | (15,178)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from initial public offering, net of underwriting discounts and commissions | 236,964 | 0 | 0
Proceeds from the issuance of preferred stock, net of issuance costs | 0 | 101,749 | 24,971
Payment of debt issuance costs | 0 | 0 | (248)
Proceeds from bank loans | 0 | 18,294 | 0
Principal payments on bank loans | 0 | (18,294) | 0
Payments of deferred offering costs | (4,691) | 0 | 0
Proceeds from the exercise of common stock warrants | 395 | 0 | 0
Proceeds from the exercise of stock options | 5,484 | 440 | 588
Other | 0 | 0 | 393
Net cash provided by financing activities | 238,152 | 102,189 | 25,704
EFFECT OF FOREIGN EXCHANGE RATE CHANGES ON CASH, CASH EQUIVALENTS, AND RESTRICTED CASH | (341) | 909 | (37)
NET INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH | 161,325 | 52,239 | 10,531
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—Beginning of year | 127,251 | 75,012 | 64,481
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—End of year | 288,576 | 127,251 | 75,012
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION: |  |  |
Cash paid for interest | 118 | 235 | 55
Cash paid for taxes | 438 | 110 | 179
NONCASH INVESTING AND FINANCING ACTIVITIES: |  |  |
Purchase of property and equipment included in accrued liabilities | 979 | 138 | 677
Repurchase of stock options | 0 | 640 | 0
Non-cash exercise of common stock warrants | 39 | 0 | 0
Deferred offering costs included in accrued liabilities | $ 744 | $ 0 | $ 0

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