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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Cash flows from operating activities: |  |
Net income (loss) | $ (31,198) | $ 8,553
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |
Stock-based compensation | 16,414 | 13,799
Depreciation | 14,889 | 12,753
Amortization of intangible assets | 7,624 | 9,284
Non-cash interest expense and amortization of convertible debt issuance costs | 151 | 3,775
Loss on extinguishment of debt | 66,497 | 0
Loss on fair value adjustment of derivatives, net | 8,283 | 0
Deferred income taxes | 1,210 | 1,317
Loss on equity investment | 622 | 453
Realized loss from sale of marketable securities | 688 | 0
Change in fair value of earn-out liability | (4,300) | 0
Gain on disposal of property, plant and equipment | (9) | 0
Change in operating assets and liabilities, net of effects of acquisition: |  |
Accounts receivable | (18,436) | (10,827)
Unbilled receivables | 46,962 | 51,463
Prepaids and other current assets | 2,850 | 4,688
Inventories | (756) | 6,414
Accounts payable | 7,425 | 1,715
Accrued salaries and benefits and other liabilities | (2,973) | (3,575)
Income taxes payable | (10,267) | (9,747)
Deferred revenue | (3,263) | 2,190
Operating lease liabilities | (3,300) | (1,203)
Net cash provided by operating activities | 99,113 | 91,052
Cash flows from investing activities: |  |
Purchases of property, plant, and equipment | (6,433) | (5,267)
Acquisition of intangible assets | (3,000) | 0
Acquisition of businesses, net of cash acquired | (15,932) | 0
Purchases of marketable securities | (56,661) | (333,782)
Maturities of marketable securities | 45,324 | 260,924
Proceeds from sales of marketable securities | 204,091 | 174,546
Net cash provided by investing activities | 167,389 | 96,421
Cash flows from financing activities: |  |
Proceeds received from issuance of common stock under employee stock plans | 3,730 | 4,186
Payments of taxes on restricted stock units | (16,429) | (8,486)
Payments under installment payment arrangements | (7,343) | (7,168)
Repurchase of convertible senior notes | (199,111) | 0
Proceeds from retirement of convertible senior note hedges | 72,415 | 0
Payments for retirement of warrants | (55,148) | 0
Repurchase and retirement of common stock, including prepayment under accelerated share repurchase program | 0 | (100,068)
Net cash used in financing activities | (201,886) | (111,536)
Effect of exchange rate changes on cash and cash equivalents | (1,054) | (168)
Net increase in cash, cash equivalents and restricted cash | 63,562 | 75,769
Cash, cash equivalents and restricted cash at beginning of period | 108,264 | 129,324
Cash, cash equivalents and restricted cash at end of period | 171,826 | 205,093
Non-cash investing and financing activities during the period: |  |
Property, plant and equipment received and accrued in accounts payable and other liabilities | 37,896 | 10,720
Operating lease right-of-use assets obtained in exchange for operating lease obligations | $ 5,301 | $ 0

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