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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Cash flows from operating activities |  |
Net income | $ 102,460 | $ 109,276
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 7,636 | 6,258
Deferred income taxes | (2,013) | (7,413)
Stock-based compensation expense | 10,159 | 7,948
Provision for doubtful accounts | (459) |
Provision for excess and obsolete inventory | 2,846 | 2,494
Accretion of discounts and premiums on marketable securities | (6,623) | (5,753)
Currency loss on foreign denominated transactions | 11,505 | 5,717
Changes in operating assets and liabilities: |  |
Accounts receivable | 25,009 | 8,173
Inventories | 12,951 | (63,294)
Prepaid expenses and other current assets | (5,849) | (5,095)
Accounts payable and other current liabilities | (18,541) | (18,266)
Deferred revenue | (35,957) | 28,075
Income taxes | (8,391) | 2,324
Other assets and liabilities | (12,443) | (3,170)
Net cash provided by operating activities | 82,290 | 67,274
Cash flows from investing activities |  |
Expenditures for property, plant and equipment and capitalized software | (3,624) | (5,202)
Purchase of short-term investments | (249,015) | (188,943)
Maturities of short-term investments | 191,345 | 120,907
Net cash used in investing activities | (61,294) | (73,238)
Cash flows from financing activities |  |
Net settlement on restricted stock grants | (11,167) | (15,465)
Repurchase of common stock | (29,995) | (24,999)
Proceeds from Employee Stock Purchase Plan purchases | 1,242 | 957
Principal payments on finance lease obligation | (736) | (598)
Proceeds from exercise of stock options |  | 25
Net cash used in financing activities | (40,656) | (40,080)
Effect of exchange rate changes on cash and cash equivalents | (2,474) | (1,147)
Net decrease in cash, cash equivalents and restricted cash | (22,134) | (47,191)
Cash, cash equivalents and restricted cash at beginning of period | 173,951 | 186,347
Cash, cash equivalents and restricted cash at end of period | $ 151,817 | $ 139,156

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