Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities
Net income	$ 109,276	$ 85,804
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,258	5,724
Deferred income taxes	(7,413)	3,934
Stock-based compensation expense	7,948	6,228
Provision for excess and obsolete inventory	2,494	2,061
Accretion of discounts and premiums on marketable securities	(5,753)
Currency loss on foreign denominated transactions	5,717
Changes in operating assets and liabilities:
Accounts receivable	8,173	(45,783)
Inventories	(63,294)	(27,511)
Prepaid expenses and other current assets	(5,095)	(5,304)
Accounts payable and other current liabilities	(18,266)	1,507
Deferred revenue	28,075	3,290
Income taxes	2,324	(529)
Other assets and liabilities	(3,170)	(199)
Net cash provided by operating activities	67,274	29,222
Cash flows from investing activities
Expenditures for property, plant and equipment and capitalized software	(5,202)	(3,356)
Purchase of short-term investments	(188,943)
Maturities of short-term investments	120,907
Net cash used in investing activities	(73,238)	(3,356)
Cash flows from financing activities
Net settlement on restricted stock grants	(15,465)	(9,211)
Repurchase of common stock	(24,999)	(32,498)
Proceeds from Employee Stock Purchase Plan purchases	957	711
Principal payments on finance lease obligation	(598)	(475)
Proceeds from exercise of stock options	25	789
Net cash used in financing activities	(40,080)	(40,684)
Effect of exchange rate changes on cash and cash equivalents	(1,147)	7,058
Net decrease in cash, cash equivalents and restricted cash	(47,191)	(7,760)
Cash, cash equivalents and restricted cash at beginning of period	186,347	295,680
Cash, cash equivalents and restricted cash at end of period	$ 139,156	$ 287,920