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