Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities
Net income	$ 102,460	$ 109,276
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,636	6,258
Deferred income taxes	(2,013)	(7,413)
Stock-based compensation expense	10,159	7,948
Provision for doubtful accounts	(459)
Provision for excess and obsolete inventory	2,846	2,494
Accretion of discounts and premiums on marketable securities	(6,623)	(5,753)
Currency loss on foreign denominated transactions	11,505	5,717
Changes in operating assets and liabilities:
Accounts receivable	25,009	8,173
Inventories	12,951	(63,294)
Prepaid expenses and other current assets	(5,849)	(5,095)
Accounts payable and other current liabilities	(18,541)	(18,266)
Deferred revenue	(35,957)	28,075
Income taxes	(8,391)	2,324
Other assets and liabilities	(12,443)	(3,170)
Net cash provided by operating activities	82,290	67,274
Cash flows from investing activities
Expenditures for property, plant and equipment and capitalized software	(3,624)	(5,202)
Purchase of short-term investments	(249,015)	(188,943)
Maturities of short-term investments	191,345	120,907
Net cash used in investing activities	(61,294)	(73,238)
Cash flows from financing activities
Net settlement on restricted stock grants	(11,167)	(15,465)
Repurchase of common stock	(29,995)	(24,999)
Proceeds from Employee Stock Purchase Plan purchases	1,242	957
Principal payments on finance lease obligation	(736)	(598)
Proceeds from exercise of stock options		25
Net cash used in financing activities	(40,656)	(40,080)
Effect of exchange rate changes on cash and cash equivalents	(2,474)	(1,147)
Net decrease in cash, cash equivalents and restricted cash	(22,134)	(47,191)
Cash, cash equivalents and restricted cash at beginning of period	173,951	186,347
Cash, cash equivalents and restricted cash at end of period	$ 151,817	$ 139,156