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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash flows from operating activities: |  |  |
Net income (loss) | $ (14,310) | $ 18,334 | $ (40,471)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Stock-based compensation | 35,552 | 27,486 | 25,778
Depreciation | 31,517 | 26,810 | 29,773
Amortization of intangible assets | 15,610 | 17,467 | 18,413
Non-cash interest expense and amortization of convertible debt issuance costs | 207 | 7,656 | 7,243
Loss on extinguishment of debt | 83,626 | 0 | 0
Loss on fair value adjustment of derivatives, net | 10,585 | 0 | 0
Deferred income taxes | 689 | 1,522 | 624
Gain on sale of equity security | (3,547) | 0 | 0
Loss on equity investment | 1,276 | 1,071 | 747
Realized loss from sale of marketable securities | 1,138 | 0 | 0
Change in fair value of earn-out liability | 3,111 | 5,300 | (1,800)
Gain on disposal of property, plant and equipment | (1) | (82) | (77)
Change in operating assets and liabilities, net of effects of acquisition: |  |  |
Accounts receivable | (9,274) | (13,521) | 16,136
Unbilled receivables | 107,945 | 118,452 | 156,202
Prepaid expenses and other assets | (707) | 6,663 | 2,057
Inventories | (12,702) | 6,109 | (4,380)
Accounts payable | 11,975 | 2,195 | (2,176)
Accrued salaries and benefits and other liabilities | (4,745) | (1,642) | 3,353
Income taxes payable | (19,279) | (25,309) | (17,852)
Deferred revenue | (1,354) | 15,496 | (1,486)
Operating lease liabilities | (6,919) | (4,790) | (6,625)
Net cash provided by operating activities | 230,393 | 209,217 | 185,459
Cash flows from investing activities: |  |  |
Purchases of property, plant and equipment | (17,478) | (13,792) | (29,728)
Acquisition of intangible assets | (3,000) | 0 | 0
Purchases of marketable securities | (150,949) | (567,947) | (909,852)
Maturities of marketable securities | 59,642 | 336,154 | 817,834
Proceeds from sale of marketable securities | 276,687 | 227,045 | 25,304
Settlement of working capital adjustment from disposal of business | 0 | 0 | (1,131)
Proceeds from sale of equity security | 3,009 | 0 | 0
Acquisition of businesses, net of cash acquired | (15,932) | (97,115) | 0
Net cash provided by (used in) investing activities | 151,979 | (115,655) | (97,573)
Cash flows from financing activities: |  |  |
Proceeds received from issuance of common stock under employee stock plans | 6,136 | 8,957 | 11,487
Payments of taxes on restricted stock units | (18,413) | (10,613) | (9,403)
Payments under installment payment arrangements | (14,378) | (12,472) | (13,201)
Repurchase of convertible senior notes | (258,060) | 0 | 0
Proceeds from retirement of convertible senior note hedges | 91,729 | 0 | 0
Payments for retirement of warrants | (69,528) | 0 | 0
Repurchase and retirement of common stock, including prepayment under accelerated share repurchase program | (100,421) | (100,081) | (50,069)
Net cash used in financing activities | (362,935) | (114,209) | (61,186)
Effect of exchange rate changes on cash, cash equivalents and restricted cash | (2,007) | (413) | 106
Net increase (decrease) in cash, cash equivalents and restricted cash | 17,430 | (21,060) | 26,806
Cash, cash equivalents and restricted cash at beginning of year | 108,264 | 129,324 | 102,518
Cash, cash equivalents and restricted cash at end of year | 125,694 | 108,264 | 129,324
Cash paid during the period for: |  |  |
Interest | 1,525 | 2,372 | 2,372
Income taxes, net of refunds | 25,275 | 22,839 | 21,312
Non-cash investing and financing activities: |  |  |
Property, plant and equipment received and accrued in accounts payable and other liabilities | 39,035 | 12,935 | 20,952
Operating lease right-of-use assets obtained in exchange for operating lease obligations | $ 5,931 | $ 0 | $ 0
Common stock issued pursuant to acquisition | 0 | 6,978 | 0

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- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 19 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3444-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=123583714&loc=SL75117360-209713 + Details
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- Definition The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585 + Details
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