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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 income | $ 83,994 | $ 28,182 | $ 13,254
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 12,255 | 12,260 | 12,546
Amortization of intangibles | 0 | 0 | 507
Stock-based compensation | 27,329 | 25,212 | 24,056
Amortization of convertible debt discount | 899 | 1,171 | 6,308
Amortization of warrant | 870 | 1,734 | 1,741
Foreign currency remeasurement | 1,453 | (2,685) | (5,126)
Deferred income taxes, net | (92,856) | 4,894 | (6,197)
Provision for expected credit losses and returns | 2,778 | 1,954 | 4,142
Provision for excess and obsolete inventories | 7,396 | 5,988 | 3,460
Gain on sale of investment in equity securities | 0 | (4,370) | 0
Other adjustments | 151 | 513 | 181
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (35,473) | (23,136) | (26,722)
Inventories | 35,403 | (54,431) | (39,338)
Other assets | 25,483 | (8,402) | (3,096)
Accounts payable | (29,358) | 5,837 | 42,303
Deferred revenues | (20,823) | 2,610 | 15,014
Other liabilities | (12,442) | 8,145 | (2,016)
Net cash provided by operating activities | 7,059 | 5,476 | 41,017
Cash flows from investing activities: |  |  |
Purchases of investments | (6,305) | 0 | 0
Proceeds from maturities of investments | 6,305 | 0 | 0
Proceeds from sales of equity investments | 0 | 7,962 | 0
Purchases of property and equipment | (8,475) | (9,250) | (12,975)
Net cash used in investing activities | (8,475) | (1,288) | (12,975)
Cash flows from financing activities: |  |  |
Payment of convertible debt | 0 | (37,707) | 0
Payments for debt issuance costs | (1,025) | 0 | 0
Proceeds from other debts | 3,835 | 3,499 | 3,861
Repayment of other debts | (4,865) | (4,583) | (6,169)
Repurchase of common stock | 0 | (5,133) | 0
Proceeds from common stock issued to employees | 6,558 | 7,092 | 12,311
Taxes paid related to net share settlement of equity awards | (9,493) | (6,301) | (2,064)
Net cash provided by (used in) financing activities | (4,990) | (43,133) | 7,939
Effect of exchange rate changes on cash and cash equivalents | 1,089 | (4,900) | (1,195)
Net increase (decrease) in cash and cash equivalents | (5,317) | (43,845) | 34,786
Cash and cash equivalents, beginning of the year | 89,586 | 133,431 | 98,645
Cash and cash equivalents, end of the year | 84,269 | 89,586 | 133,431
Supplemental disclosure of cash flow information: |  |  |
Income tax payments, net | 18,128 | 9,036 | 2,525
Interest payments, net | 1,626 | 3,796 | 4,095
Supplemental schedule of non-cash investing and financing activities: |  |  |
Capital expenditures incurred but not yet paid | $ 618 | $ 1,075 | $ 751

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