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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Cash flows from operating activities: |  |
Net income | $ 68,954 | $ 172,161
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Stock-based compensation | 21,147 | 24,438
Depreciation | 15,242 | 18,678
Amortization of intangible assets | 6,490 | 7,888
Loss on fair value adjustment of derivatives, net | 0 | 240
Impairment of assets | 1,071 | 0
Deferred income taxes | (2,786) | (156,519)
Change in fair value of earn-out liability | (500) | 13,800
Other | 29 | 489
Change in operating assets and liabilities: |  |
Accounts receivable | (268) | (8,540)
Unbilled receivables | 21,411 | 53,070
Prepaids and other current assets | 270 | (421)
Inventories | (16,442) | (12,627)
Income taxes receivable | (9,915) | (28)
Accounts payable | 4,051 | (9,204)
Accrued salaries and benefits and other liabilities | (4,291) | 5,126
Income taxes payable | 9,647 | (9,158)
Deferred revenue | (1,640) | (7,200)
Operating lease liabilities | (2,929) | (2,845)
Net cash provided by operating activities | 109,541 | 89,348
Cash flows from investing activities: |  |
Purchases of property, plant, and equipment | (14,338) | (14,487)
Purchases of marketable securities | (224,164) | (137,241)
Maturities of marketable securities | 160,756 | 29,155
Proceeds from sales of marketable securities | 85,722 | 87,591
Proceeds from sale of non-marketable equity security | 22,796 | 0
Net cash provided by (used in) investing activities | 30,772 | (34,982)
Cash flows from financing activities: |  |
Proceeds received from issuance of common stock under employee stock plans | 3,351 | 5,084
Payments of taxes on restricted stock units | (38,593) | (31,921)
Payments under installment payment arrangements | (9,048) | (7,931)
Payments for settlement and repurchase of convertible senior notes | 0 | (10,381)
Payments for settlement of warrants | 0 | (10,697)
Payment of deferred purchase consideration from acquisition | (2,450) | (2,450)
Repurchase and retirement of common stock | (63,312) | 0
Net cash used in financing activities | (110,052) | (58,296)
Effect of exchange rate changes on cash and cash equivalents | (450) | 426
Net increase (decrease) in cash and cash equivalents | 29,811 | (3,504)
Cash and cash equivalents at beginning of period | 94,767 | 125,694
Cash and cash equivalents at end of period | 124,578 | 122,190
Non-cash operating, investing and financing activities: |  |
Property, plant and equipment received and accrued in accounts payable and other liabilities | 6,865 | 4,226
Operating lease right-of-use assets obtained in exchange for operating lease obligations | 3,034 | 0
Issuance of common stock in connection with the payment of year 1 earn-out related to the PLDA acquisition | $ 0 | $ 5,022

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