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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |
Net loss | $ (29,271) | $ (5,924) | $ (21,035)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |
Depreciation | 11,737 | 11,287 | 12,971
Amortization of intangibles | 3,970 | 8,319 | 8,367
Stock-based compensation | 18,040 | 12,074 | 17,289
Amortization of discount on convertible and other debt | 7,058 | 6,756 | 6,060
Amortization of warrant | 1,746 | 13,576 | 1,178
Foreign currency adjustments | 6,391 | (290) | (1,906)
Loss on convertible debt extinguishment | 1,362 | 5,695 | 0
Deferred income taxes, net | (105) | (2,076) | 661
Provision for doubtful accounts and returns | 1,666 | 1,500 | 2,521
Provision for excess and obsolete inventories | 1,847 | 1,479 | 1,649
Other non-cash adjustments, net | 409 | 1,349 | 1,898
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 21,186 | (8,388) | (14,700)
Inventories | (8,195) | (4,819) | (2,045)
Other assets | 11,556 | (3,347) | 3,227
Accounts payable | (18,173) | 5,086 | 1,018
Deferred revenues | 19,751 | (3,436) | (4,808)
Other liabilities | (11,812) | (7,546) | (61)
Net cash provided by operating activities | 39,163 | 31,295 | 12,284
Cash flows from investing activities: |  |  |
Proceeds from sales of investments | 0 | 0 | 104
Purchases of property and equipment | (32,205) | (10,328) | (7,044)
Net cash used in investing activities | (32,205) | (10,328) | (6,940)
Cash flows from financing activities: |  |  |
Proceeds from convertible debt | 0 | 115,500 | 0
Payments of convertible debt | (7,999) | (109,603) | 0
Payment of convertible debt issuance costs | (672) | (4,277) | 0
Proceeds from other debts | 9,398 | 4,684 | 5,066
Repayment of other debts and finance leases | (6,646) | (6,913) | (7,132)
Proceeds from common stock issued to employees | 5,472 | 8,406 | 4,947
Payment of tax withholding obligations related to net share settlements of restricted stock units | (1,662) | (1,492) | (230)
Net cash (used in) provided by financing activities | (2,109) | 6,305 | 2,651
Effect of exchange rate changes on cash and cash equivalents | 738 | (203) | (763)
Net increase in cash and cash equivalents | 5,587 | 27,069 | 7,232
Cash and cash equivalents, beginning of the year | 93,058 | 65,989 | 58,757
Cash and cash equivalents, end of the year | 98,645 | 93,058 | 65,989
Supplemental disclosures of cash flow information: |  |  |
Income tax payments (refunds), net | (17) | 1,138 | 2,031
Interest payments, net | 4,221 | 4,260 | 5,273
Supplemental schedule of non-cash investing and financing activities: |  |  |
Capital expenditures incurred but not yet paid | 1,155 | 2,055 | 148
Fair value of warrants issued | 0 | 16,142 | 2,295
Convertible Notes 2022 [Member] |  |  |
Supplemental schedule of non-cash investing and financing activities: |  |  |
Fair value of 2022 Notes used to settle 2020 Notes | $ 44,357 | $ 0 | $ 0

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