Income Taxes - Schedule of Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Tax at statutory U.S. tax rate	$ (13,300)	$ 2,400
State income taxes, net of federal benefit	(2,500)	500
Valuation allowances	(4,500)	(28,600)
Goodwill impairment	10,600
Pension and debt forgiveness	9,700
Tax on unremitted earnings of foreign subsidiaries		(400)
Stock-based compensation		300
Net effect of subsidiary sale		25,000
Reclassification to discontinued operations and other		800
Income tax (provision) benefit