CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities
Net loss	$ (8,938)	$ (34,358)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	7,559	7,416
Stock-based compensation expense	2,527	3,186
Restructuring and other charges	32	25,020
Gain on sale of property, plant and equipment	(114)	(3,955)
Deferred income taxes	1,327	(433)
Changes in operating assets and liabilities:
Trade receivables, net	14,849	11,024
Unbilled receivables	(6,951)	802
Inventories, net	5,658	(5,794)
Prepaids and other assets	(1,768)	4,962
Accounts payable and accrued expenses	(25,109)	5,202
Net cash provided by (used in) operating activities	(10,928)	13,072
Investing activities
Purchase of property, plant and equipment	(2,066)	(2,513)
Proceeds from sale of property, plant and equipment	208	5,944
Net cash provided by (used in) investing activities	(1,858)	3,431
Financing activities
Repurchase of common shares	(5,808)	0
Other	(51)	(40)
Net cash used in financing activities	(5,859)	(40)
Effect of exchange rate changes on cash activities	1,202	(205)
Increase (decrease) in cash and cash equivalents	(17,443)	16,258
Cash and cash equivalents at beginning of period	355,451	345,955
Cash and cash equivalents at end of period	$ 338,008	$ 362,213