Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net income	$ 41,614	$ 16,480
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,848	2,645
Deferred income taxes	2,252	1,613
Stock-based compensation expense	2,701	2,407
Provision for excess and obsolete inventory	1,027	984
Changes in operating assets and liabilities:
Accounts receivable	(15,199)	10,431
Inventories	(11,490)	(16,503)
Prepaid expenses and other current assets	(1,852)	(3,325)
Accounts payable and other current liabilities	(3,582)	(1,008)
Deferred revenue	6,418	(909)
Income taxes	858	2
Other assets and liabilities	175	2,281
Net cash provided by operating activities	25,770	15,098
Cash flows from investing activities
Expenditures for property, plant and equipment and capitalized software	(1,503)	(1,347)
Net cash used in investing activities	(1,503)	(1,347)
Cash flows from financing activities
Net settlement on restricted stock grants	(3,315)	(2,354)
Repurchase of common stock	(20,000)	(11,635)
Principal payments on finance lease obligation	(229)	(175)
Proceeds from exercise of stock options	491	2,512
Net cash used in financing activities	(23,053)	(11,652)
Effect of exchange rate changes on cash and cash equivalents	1,002	1,188
Net increase in cash, cash equivalents and restricted cash	2,216	3,287
Cash, cash equivalents and restricted cash at beginning of period	295,680	204,232
Cash, cash equivalents and restricted cash at end of period	$ 297,896	$ 207,519