Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net income	$ 183,079	$ 98,650	$ 49,982
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,607	10,818	9,939
Gain on sale of equipment			(168)
Deferred income taxes	8,536	20,257	4,685
Stock-based compensation expense	13,444	12,067	10,485
Provision for excess and obsolete inventory	4,565	3,755	3,696
Foreign currency remeasurement	5,986
Changes in operating assets and liabilities:
Accounts receivable	(67,270)	(18,146)	(1,393)
Inventories	(58,433)	(39,023)	(17,652)
Prepaid expenses and other current assets	(6,533)	(3,955)	(7,322)
Accounts payable and other current liabilities	31,392	22,046	18,062
Deferred revenue	86,366	45,385	(6,215)
Income taxes	3,493	253	332
Other assets and liabilities	(625)	(1,917)	5,272
Net cash provided by operating activities	215,607	150,190	69,703
Cash flows from investing activities
Proceeds from sale of equipment			168
Expenditures for property, plant and equipment and capitalized software	(10,683)	(8,718)	(7,434)
Purchase of short-term investments	(246,571)
Net cash used in investing activities	(257,254)	(8,718)	(7,266)
Cash flows from financing activities
Net settlement on restricted stock grants	(9,907)	(6,564)	(3,915)
Repurchase of common stock	(57,495)	(49,992)	(7,501)
Proceeds from Employee Stock Purchase Plan purchases	1,662	1,179	1,009
Principal payments on finance lease obligation	(987)	(763)	(399)
Proceeds from exercise of stock options	1,247	3,687	8,419
Net cash used in financing activities	(65,480)	(52,453)	(2,387)
Effect of exchange rate changes on cash and cash equivalents	(2,206)	2,429	(2,352)
Net increase in cash, cash equivalents and restricted cash	(109,333)	91,448	57,698
Cash, cash equivalents and restricted cash at beginning of period	295,680	204,232	146,534
Cash, cash equivalents and restricted cash at end of period	186,347	295,680	204,232
Supplemental disclosure of cash flow information
Income taxes	10,763	1,500	876
Interest	$ 4,992	$ 5,086	$ 5,156