Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net income	$ 246,263	$ 183,079	$ 98,650
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,069	11,607	10,818
Deferred income taxes	(20,018)	8,536	20,257
Stock-based compensation expense	18,269	13,444	12,067
Provision for doubtful accounts	1,129
Provision for excess and obsolete inventory	5,211	4,565	3,755
Accretion of discounts and premiums on marketable securities	(12,077)
Currency loss on foreign denominated transactions	2,252	5,986
Changes in operating assets and liabilities:
Accounts receivable	(50,755)	(67,270)	(18,146)
Inventories	(69,957)	(58,433)	(39,023)
Prepaid expenses and other current assets	(16,046)	(6,533)	(3,955)
Accounts payable and other current liabilities	(8,103)	31,392	22,046
Deferred revenue	56,183	86,366	45,385
Income taxes	3,786	3,493	253
Other assets and liabilities	(12,337)	(625)	(1,917)
Net cash provided by operating activities	156,869	215,607	150,190
Cash flows from investing activities
Expenditures for property, plant and equipment and capitalized software	(20,656)	(10,683)	(8,718)
Purchase of short-term investments	(388,809)	(246,571)
Maturities of short-term investments	308,607
Net cash used in investing activities	(100,858)	(257,254)	(8,718)
Cash flows from financing activities
Net settlement on restricted stock grants	(16,611)	(9,907)	(6,564)
Repurchase of common stock	(52,499)	(57,495)	(49,992)
Proceeds from Employee Stock Purchase Plan purchases	2,057	1,662	1,179
Principal payments on finance lease obligation	(1,240)	(987)	(763)
Proceeds from exercise of stock options	25	1,247	3,687
Net cash used in financing activities	(68,268)	(65,480)	(52,453)
Effect of exchange rate changes on cash and cash equivalents	(139)	(2,206)	2,429
Net (decrease) increase in cash, cash equivalents and restricted cash	(12,396)	(109,333)	91,448
Cash, cash equivalents and restricted cash at beginning of period	186,347	295,680	204,232
Cash, cash equivalents and restricted cash at end of period	173,951	186,347	295,680
Supplemental disclosure of cash flow information
Income taxes	54,217	10,763	1,500
Interest	$ 4,874	$ 4,992	$ 5,086