Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities
Net income	$ 175,207	$ 126,087
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	9,488	8,614
Deferred income taxes	(12,623)	6,416
Stock-based compensation expense	13,030	9,790
Provision for doubtful accounts	749
Provision for excess and obsolete inventory	3,912	3,292
Accretion of discounts and premiums on marketable securities	(8,463)
Currency loss on foreign denominated transactions	7,487
Changes in operating assets and liabilities:
Accounts receivable	(26,674)	(77,449)
Inventories	(79,494)	(49,699)
Prepaid expenses and other current assets	(16,493)	(4,861)
Accounts payable and other current liabilities	(8,916)	17,695
Deferred revenue	47,704	54,814
Income taxes	(3,672)	(274)
Other assets and liabilities	(9,948)	(1,202)
Net cash provided by operating activities	91,294	93,223
Cash flows from investing activities
Expenditures for property, plant and equipment and capitalized software	(10,503)	(6,876)
Purchase of short-term investments	(271,583)	(33,576)
Maturities of short-term investments	207,907
Net cash used in investing activities	(74,179)	(40,452)
Cash flows from financing activities
Net settlement on restricted stock grants	(15,814)	(9,281)
Repurchase of common stock	(37,498)	(44,995)
Proceeds from Employee Stock Purchase Plan purchases	957	711
Principal payments on finance lease obligation	(915)	(728)
Proceeds from exercise of stock options	25	1,156
Net cash used in financing activities	(53,245)	(53,137)
Effect of exchange rate changes on cash and cash equivalents	(1,267)	13,987
Net (decrease) increase in cash, cash equivalents and restricted cash	(37,397)	13,621
Cash, cash equivalents and restricted cash at beginning of period	186,347	295,680
Cash, cash equivalents and restricted cash at end of period	$ 148,950	$ 309,301