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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash Flows from Operating Activities
Net income	$ 13,330	$ 2,494
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	6,240	6,822
Non-cash interest expense	238	3,514
Deferred income taxes	(16)	(4)
Share-based compensation expense	4,481	3,237
Changes in operating assets and liabilities:
Accounts receivable and contract assets	2,821	(6,811)
Inventories	(8,254)	(10,474)
Prepaid expenses and other current assets	(8,240)	(336)
Accounts payable and accrued expenses	14,773	12,612
Customer deposits and deferred revenue	(1,243)	1,672
Income taxes receivable and payable, net	(228)	172
Other, net	886	(2,413)
Net cash provided by (used in) operating activities	24,788	10,485
Cash Flows from Investing Activities
Capital expenditures	(10,918)	(1,953)
Proceeds from the sale of investments	2,260	55,385
Payments for purchases of investments	(2,498)	(52,037)
Net cash provided by (used in) investing activities	(11,156)	1,395
Cash Flows from Financing Activities
Proceeds (net of tax withholdings) from option exercises and employee stock purchase plan	998	878
Restricted stock tax withholdings	(6,787)	(1,625)
Net cash provided by (used in) financing activities	(5,789)	(747)
Effect of exchange rate changes on cash and cash equivalents	(3)	(30)
Net increase (decrease) in cash, cash equivalents, and restricted cash	7,840	11,103
Cash, cash equivalents, and restricted cash - beginning of period	120,472	130,283
Cash, cash equivalents, and restricted cash - end of period	128,312	141,386
Supplemental Disclosure of Cash Flow Information
Interest paid	2,593	1,803
Income taxes paid	523	240
Non-cash activities
Capital expenditures included in accounts payable and accrued expenses	6,253	2,138
Net transfer of inventory to property, plant and equipment	46
Right-of-use assets obtained in exchange for lease obligations	$ 258	$ 20,353

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