Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax provision	$ 0	$ 100,000	$ 100,000	$ 0
Loss from continuing operations before income taxes	2,300,000	$ 5,800,000	3,500,000	$ 13,200,000
Income taxes receivable, noncurrent	2,200,000		2,200,000
Tax reform adjustments	0
Unrecognized tax benefits	$ 800,000		$ 800,000		$ 900,000