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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 income (loss) | $ 13,254 | $ (29,271) | $ (5,924)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation | 12,546 | 11,737 | 11,287
Amortization of intangibles | 507 | 3,970 | 8,319
Stock-based compensation | 24,056 | 18,040 | 12,074
Amortization of convertible debt discount | 6,308 | 7,058 | 6,756
Amortization of warrant | 1,741 | 1,746 | 13,576
Foreign currency remeasurement | (5,126) | 6,391 | (290)
Loss on convertible debt extinguishment | 0 | 1,362 | 5,695
Deferred income taxes, net | (6,197) | (105) | (2,076)
Provision for expected credit losses and returns | 4,142 | 1,666 | 1,500
Provision for excess and obsolete inventories | 3,460 | 1,847 | 1,479
Other adjustments | 181 | 409 | 1,349
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (26,722) | 21,186 | (8,388)
Inventories | (39,338) | (8,195) | (4,819)
Other assets | (3,096) | 11,556 | (3,347)
Accounts payable | 42,303 | (18,173) | 5,086
Deferred revenues | 15,014 | 19,751 | (3,436)
Other liabilities | (2,016) | (11,812) | (7,546)
Net cash provided by operating activities | 41,017 | 39,163 | 31,295
Cash flows from investing activities: |  |  |
Purchases of property and equipment | (12,975) | (32,205) | (10,328)
Net cash used in investing activities | (12,975) | (32,205) | (10,328)
Cash flows from financing activities: |  |  |
Proceeds from convertible debt | 0 | 0 | 115,500
Repayment of convertible debt | 0 | (7,999) | (109,603)
Payment of convertible debt issuance costs | 0 | (672) | (4,277)
Proceeds from other debts | 3,861 | 9,398 | 4,684
Repayment of other debts | (6,169) | (6,646) | (6,913)
Proceeds from common stock issued to employees | 12,311 | 5,472 | 8,406
Payment of tax withholding obligations related to net share settlements of restricted stock units | (2,064) | (1,662) | (1,492)
Net cash provided by (used in) financing activities | 7,939 | (2,109) | 6,305
Effect of exchange rate changes on cash and cash equivalents | (1,195) | 738 | (203)
Net increase in cash and cash equivalents | 34,786 | 5,587 | 27,069
Cash and cash equivalents, beginning of the year | 98,645 | 93,058 | 65,989
Cash and cash equivalents, end of the year | 133,431 | 98,645 | 93,058
Supplemental disclosures of cash flow information: |  |  |
Income tax payments (refunds), net | 2,525 | (17) | 1,138
Interest payments, net | 4,095 | 4,221 | 4,260
Supplemental schedule of non-cash investing and financing activities: |  |  |
Capital expenditures incurred but not yet paid | 751 | 1,155 | 2,055
Fair value of warrants issued | 0 | 0 | 16,142
Fair value of 2022 Notes used to settle 2020 Notes | $ 0 | $ 44,357 | $ 0

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