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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Cash flows from operating activities: |  |
Net income (loss) | $ 172,161 | $ (31,198)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |
Stock-based compensation | 24,438 | 16,414
Depreciation | 18,678 | 14,889
Amortization of intangible assets | 7,888 | 7,624
Loss on extinguishment of debt | 0 | 66,497
Loss on fair value adjustment of derivatives, net | 240 | 8,283
Deferred income taxes | (156,519) | 1,210
Change in fair value of earn-out liability | 13,800 | (4,300)
Other | 489 | 1,452
Change in operating assets and liabilities, net of effects of acquisition: |  |
Accounts receivable | (8,540) | (18,436)
Unbilled receivables | 53,070 | 46,962
Prepaids and other current assets | (449) | 2,850
Inventories | (12,627) | (756)
Accounts payable | (9,204) | 7,425
Accrued salaries and benefits and other liabilities | 5,126 | (2,973)
Income taxes payable | (9,158) | (10,267)
Deferred revenue | (7,200) | (3,263)
Operating lease liabilities | (2,845) | (3,300)
Net cash provided by operating activities | 89,348 | 99,113
Cash flows from investing activities: |  |
Purchases of property, plant, and equipment | (14,487) | (6,433)
Acquisition of intangible assets | 0 | (3,000)
Acquisition of business, net of cash acquired | 0 | (15,932)
Purchases of marketable securities | (137,241) | (56,661)
Maturities of marketable securities | 29,155 | 45,324
Proceeds from sales of marketable securities | 87,591 | 204,091
Net cash provided by (used in) investing activities | (34,982) | 167,389
Cash flows from financing activities: |  |
Proceeds received from issuance of common stock under employee stock plans | 5,084 | 3,730
Payments of taxes on restricted stock units | (31,921) | (16,429)
Payments under installment payment arrangements | (7,931) | (7,343)
Payments for settlement and repurchase of convertible senior notes | (10,381) | (199,111)
Proceeds from retirement of convertible senior note hedges | 0 | 72,415
Payments for settlement of warrants | (10,697) | (55,148)
Payment of deferred purchase consideration from acquisition | (2,450) | 0
Net cash used in financing activities | (58,296) | (201,886)
Effect of exchange rate changes on cash and cash equivalents | 426 | (1,054)
Net increase (decrease) in cash, cash equivalents and restricted cash | (3,504) | 63,562
Cash, cash equivalents and restricted cash at beginning of period | 125,694 | 108,264
Cash, cash equivalents and restricted cash at end of period | 122,190 | 171,826
Non-cash investing and financing activities during the period: |  |
Property, plant and equipment received and accrued in accounts payable and other liabilities | 33,256 | 37,896
Issuance of common stock in connection with the payment of year 1 earn-out related to the PLDA Group acquisition | 5,022 | 0
Operating lease right-of-use assets obtained in exchange for operating lease obligations | $ 0 | $ 5,301

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