Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities
Net income	$ 120,238	$ 200,992	$ 246,263
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,613	15,809	13,069
Deferred income taxes	(10,697)	(15,594)	(20,018)
Stock-based compensation expense	20,773	20,951	18,269
Provision for doubtful accounts		2,987	1,129
Provision for excess and obsolete inventory	3,890	5,966	5,211
Accretion of discounts and premiums on short-term and long-term investments	(4,154)	(12,435)	(12,077)
Unrealized currency gain on foreign denominated transactions	1,935	7,811	2,252
Mark-to-market adjustment on forward exchange contracts	(435)	(267)
Changes in operating assets and liabilities:
Accounts receivable	37,431	6,909	(50,755)
Inventories	(42,217)	5,917	(69,957)
Prepaid expenses and other current assets	(5,214)	(11,703)	(16,046)
Accounts payable and other current liabilities	6,191	(413)	(8,103)
Deferred revenue	(29,651)	(71,097)	56,183
Income taxes	13,115	(9,034)	3,786
Other assets and liabilities	(10,513)	(5,981)	(12,337)
Net cash provided by operating activities	118,305	140,818	156,869
Cash flows from investing activities
Expenditures for property, plant and equipment and capitalized software	(11,295)	(12,181)	(20,656)
Purchases of short-term and long-term investments	(645,998)	(539,120)	(388,809)
Maturities and sales of short-term investments	687,220	442,575	308,607
Net cash provided by (used in) investing activities	29,927	(108,726)	(100,858)
Cash flows from financing activities
Net settlement on restricted stock grants	(4,514)	(11,563)	(16,611)
Repurchase of common stock	(121,081)	(60,489)	(52,499)
Proceeds from Employee Stock Purchase Plan purchases	2,459	2,385	2,057
Principal payments on finance lease obligation	(1,357)	(1,525)	(1,240)
Proceeds from exercise of stock options			25
Net cash used in financing activities	(124,493)	(71,192)	(68,268)
Effect of exchange rate changes on cash and cash equivalents	1,275	(3,787)	(139)
Net increase (decrease) in cash, cash equivalents and restricted cash	25,014	(42,887)	(12,396)
Cash, cash equivalents and restricted cash at beginning of period	131,064	173,951	186,347
Cash, cash equivalents and restricted cash at end of period	156,078	131,064	173,951
Supplemental disclosure of cash flow information
Interest	$ 4,573	$ 4,727	$ 4,874