Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities
Net income	$ 126,087	$ 62,901
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,614	7,993
Deferred income taxes	6,416	11,558
Stock-based compensation expense	9,790	8,970
Provision for excess and obsolete inventory	3,292	2,773
Changes in operating assets and liabilities:
Accounts receivable	(77,449)	8,133
Inventories	(49,699)	(39,595)
Prepaid expenses and other current assets	(4,861)	(4,879)
Accounts payable and other current liabilities	17,695	17,933
Deferred revenue	54,814	35,189
Income taxes	(274)	(24)
Other assets and liabilities	(1,202)	1,129
Net cash provided by operating activities	93,223	112,081
Cash flows from investing activities
Expenditures for property, plant and equipment and capitalized software	(6,876)	(5,701)
Purchase of short-term investments	(33,576)
Net cash used in investing activities	(40,452)	(5,701)
Cash flows from financing activities
Net settlement on restricted stock grants	(9,281)	(6,543)
Repurchase of common stock	(44,995)	(37,493)
Proceeds from Employee Stock Purchase Plan purchases	711	509
Principal payments on finance lease obligation	(728)	(562)
Proceeds from exercise of stock options	1,156	3,419
Net cash used in financing activities	(53,137)	(40,670)
Effect of exchange rate changes on cash and cash equivalents	13,987	1,899
Net increase in cash, cash equivalents and restricted cash	13,621	67,609
Cash, cash equivalents and restricted cash at beginning of period	295,680	204,232
Cash, cash equivalents and restricted cash at end of period	$ 309,301	$ 271,841