Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities
Net income	$ 151,036	$ 175,207
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,542	9,488
Deferred income taxes	(5,510)	(12,623)
Stock-based compensation expense	15,571	13,030
Provision for doubtful accounts	2,984	749
Provision for excess and obsolete inventory	4,120	3,912
Accretion of discounts and premiums on marketable securities	(10,167)	(8,463)
Unrealized currency (gain) loss on foreign denominated transactions	(3,100)	7,487
Mark-to-market adjustment on foreign exchange contracts	583
Changes in operating assets and liabilities:
Accounts receivable	28,774	(26,674)
Inventories	11,299	(79,494)
Prepaid expenses and other current assets	(8,110)	(16,493)
Accounts payable and other current liabilities	(2,738)	(8,916)
Deferred revenue	(46,700)	47,704
Income taxes	(14,132)	(3,672)
Other assets and liabilities	(7,414)	(9,948)
Net cash provided by operating activities	128,038	91,294
Cash flows from investing activities
Expenditures for property, plant and equipment and capitalized software	(7,523)	(10,503)
Purchase of short-term investments	(433,894)	(271,583)
Maturities of short-term investments	323,570	207,907
Net cash used in investing activities	(117,847)	(74,179)
Cash flows from financing activities
Net settlement on restricted stock grants	(11,408)	(15,814)
Repurchase of common stock	(45,358)	(37,498)
Proceeds from Employee Stock Purchase Plan purchases	1,242	957
Principal payments on finance lease obligation	(1,125)	(915)
Proceeds from exercise of stock options		25
Net cash used in financing activities	(56,649)	(53,245)
Effect of exchange rate changes on cash and cash equivalents	(774)	(1,267)
Net decrease in cash, cash equivalents and restricted cash	(47,232)	(37,397)
Cash, cash equivalents and restricted cash at beginning of period	173,951	186,347
Cash, cash equivalents and restricted cash at end of period	$ 126,719	$ 148,950