Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net income	$ 49,982	$ 17,034	$ 45,885
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	9,939	7,880	5,772
Gain on sale of equipment	(168)
Deferred income taxes	4,685	3,304	11,209
Stock-based compensation expense	10,485	8,173	7,784
Provision for doubtful accounts		818
Provision for excess and obsolete inventory	3,696	2,794	2,205
Changes in operating assets & liabilities:
Accounts receivable	(1,393)	(6,002)	(3,877)
Inventories	(17,652)	(17,953)	(10,512)
Prepaid expenses and other current assets	(7,322)	(104)	(1,436)
Accounts payable and other current liabilities	18,062	(19,150)	(703)
Deferred revenue	(6,215)	6,672	6,055
Income taxes	332	(162)	196
Other assets and liabilities	5,272	(16,898)	(15,613)
Net cash provided by (used in) operating activities	69,703	(13,594)	46,965
Cash flows from investing activities
Proceeds from sale of equipment	168
Expenditures for property, plant and equipment and capitalized software	(7,434)	(11,969)	(4,715)
Net cash used in investing activities	(7,266)	(11,969)	(4,715)
Cash flows from financing activities
Net settlement on restricted stock grants	(3,915)	(1,632)	(1,419)
Repurchase of common stock	(7,501)	(17,744)
Proceeds from Employee Stock Purchase Plan	1,009	863	871
Principal payments on finance lease obligation	(399)
Proceeds from exercise of stock options	8,419	5,105	1,734
Net cash used in financing activities	(2,387)	(13,408)	1,186
Effect of exchange rate changes on cash and cash equivalents	(2,352)	603	586
Net increase (decrease) in cash, cash equivalents and restricted cash	57,698	(38,368)	44,022
Cash, cash equivalents and restricted cash at beginning of period	146,534	184,902	140,880
Cash, cash equivalents and restricted cash at end of period	204,232	146,534	184,902
Supplemental disclosure of cash flow information
Income taxes	876	1,028	858
Interest	$ 5,156	$ 5,207	$ 5,470

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