Income Taxes - Schedule of Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax at statutory U.S. tax rate	$ 1,900	$ 10,000
State income taxes, net of federal benefit	600	1,000
Net effect of international operations	(4,000)	1,100
Federal rate reduction effect on deferred tax assets		(104,900)
Valuation allowances	30,800	91,800
Tax on unremitted earnings of foreign subsidiaries	500	5,100
U.S. tax on foreign earnings	(200)	(200)
Stock-based compensation	(300)	(900)
Net effect of subsidiary sale	(29,200)
Goodwill impairment		(1,400)
Minimum tax credit refundable	100	2,100
Reclassification to discontinued operations and other	(100)	2,000
Income tax (provision) benefit	$ 100	$ 5,700