CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net sales	$ 124,813	$ 149,167	$ 364,114	$ 397,319
Cost of sales	96,225	113,912	274,258	311,419
Gross profit	28,588	35,255	89,856	85,900
Operating expenses:
Selling, general and administrative expenses	12,888	10,686	37,398	33,817
Research and development expenses	12,477	10,233	34,094	34,049
Other charges			554
Total operating expenses	25,365	20,919	72,046	67,866
Operating income	3,223	14,336	17,810	18,034
Interest expense	(5,485)	(5,539)	(16,522)	(16,615)
Foreign currency gain (loss), net	8,864	(21,985)	(13,638)	(44,166)
Loss on early extinguishment of long-term borrowings, net				(42)
Other income, net	714	678	2,343	1,816
Income (loss) from continuing operations before income tax expense	7,316	(12,510)	(10,007)	(40,973)
Income tax expenses (benefits)	(1,145)	1,734	836	3,316
Income (loss) from continuing operations	8,461	(14,244)	(10,843)	(44,289)
Income (loss) from discontinued operations, net of tax	264,501	12,637	289,227	(963)
Net income (loss)	$ 272,962	$ (1,607)	$ 278,384	$ (45,252)
Basic earnings (loss) per common share—
Continuing operations	$ 0.24	$ (0.41)	$ (0.31)	$ (1.29)
Discontinued operations	7.50	0.36	8.24	(0.03)
Total	7.74	(0.05)	7.93	(1.32)
Diluted earnings (loss) per common share—
Continuing operations	0.21	(0.41)	(0.31)	(1.29)
Discontinued operations	5.68	0.36	8.24	(0.03)
Total	$ 5.89	$ (0.05)	$ 7.93	$ (1.32)
Weighted average number of shares—
Basic	35,280,864	34,357,745	35,089,479	34,266,513
Diluted	46,581,788	34,357,745	35,089,479	34,266,513
Standard Products Group [Member]
Net sales	$ 116,262	$ 139,273	$ 335,953	$ 371,543
Cost of sales	87,494	104,018	245,917	285,643
Gross profit	28,768	35,255	90,036	85,900
Fab Three Foundry Services [Member]
Net sales	8,551	9,894	28,161	25,776
Cost of sales	8,731	$ 9,894	28,341	$ 25,776
Gross profit