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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Cash flows from operating activities |  |
Net income | $ 51,595 | $ 47,697
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 3,775 | 3,100
Deferred income taxes | (1,097) | (3,621)
Stock-based compensation expense | 4,690 | 3,199
Provision for doubtful accounts | (459) |
Provision for excess and obsolete inventory | 1,445 | 1,069
Accretion of discounts and premiums on marketable securities | (3,306) | (2,840)
Currency loss on foreign denominated transactions | 6,560 | 1,343
Changes in operating assets and liabilities: |  |
Accounts receivable | 7,042 | (20,762)
Inventories | (11,427) | (21,105)
Prepaid expenses and other current assets | (5,489) | (4,794)
Accounts payable and other current liabilities | (29,118) | (22,976)
Deferred revenue | (1,963) | 47,160
Income taxes | 21,374 | 8,891
Other assets and liabilities | (1,399) | (1,802)
Net cash provided by operating activities | 42,223 | 34,559
Cash flows from investing activities |  |
Expenditures for property, plant and equipment and capitalized software | (1,620) | (2,240)
Purchase of short-term investments | (145,121) | (61,809)
Maturities of short-term investments | 91,050 | 31,000
Net cash used in investing activities | (55,691) | (33,049)
Cash flows from financing activities |  |
Net settlement on restricted stock grants | (2,699) | (3,907)
Repurchase of common stock | (14,999) | (12,499)
Principal payments on finance lease obligation | (357) | (289)
Proceeds from exercise of stock options |  | 25
Net cash used in financing activities | (18,055) | (16,670)
Effect of exchange rate changes on cash and cash equivalents | (1,813) | (55)
Net decrease in cash, cash equivalents and restricted cash | (33,336) | (15,215)
Cash, cash equivalents and restricted cash at beginning of period | 173,951 | 186,347
Cash, cash equivalents and restricted cash at end of period | $ 140,615 | $ 171,132

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