CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities
Net income (loss)	$ 2,311	$ (8,938)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	6,889	7,559
Stock-based compensation expense	2,577	2,527
Restructuring and other charges	683	32
Gain on sale of property, plant and equipment	(6,647)	(114)
Deferred income taxes	(211)	1,327
Changes in operating assets and liabilities:
Trade receivables, net	(39,531)	14,849
Unbilled receivables	(6,376)	(6,951)
Inventories, net	(4,758)	5,658
Prepaids and other assets	1,335	(1,768)
Accounts payable and accrued expenses	(9,192)	(25,109)
Net cash used in operating activities	(52,920)	(10,928)
Investing activities
Purchase of property, plant and equipment	(5,424)	(2,066)
Proceeds from sale of property, plant and equipment	15,460	208
Purchase of short-term investments	(9,081)	0
Maturities of short-term investments	22,392	0
Net cash provided by (used in) investing activities	23,347	(1,858)
Financing activities
Repurchase of common shares	0	(5,808)
Other	(11)	(51)
Net cash used in financing activities	(11)	(5,859)
Effect of exchange rate changes on cash activities	123	1,202
Decrease in cash and cash equivalents	(29,461)	(17,443)
Cash and cash equivalents at beginning of period	264,804	355,451
Cash and cash equivalents at end of period	$ 235,343	$ 338,008