Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax benefit	$ 0	$ (3,500,000)	$ 0	$ (3,500,000)
Loss from continuing operations before income taxes	2,100,000	$ 1,600,000	5,900,000	$ 6,900,000
Income taxes receivable, noncurrent	2,100,000		2,100,000
Tax reform adjustments	0
Unrecognized tax benefits	$ 700,000		$ 700,000		$ 900,000