Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Examination [Line Items]
Income tax (benefit) expense	$ (137)	$ 24	$ (90)	$ 130
Effective income tax rate reconciliation, percent	3.40%	0.30%	0.40%	1.50%
Foreign income tax expense (benefit)	$ 100		$ 100
Remeasurement at new rate, percent					21.00%
Operating loss carryforwards					$ 41,700
Not Subject to Limitations | Subsequent To Change Date In 2010
Income Tax Examination [Line Items]
Operating loss carryforwards					23,100
Subject to Limitations | Minimum
Income Tax Examination [Line Items]
Operating loss carryforwards					1,000
Subject to Limitations | Maximum
Income Tax Examination [Line Items]
Operating loss carryforwards					2,300
Alternative Minimum Tax Carryover
Income Tax Examination [Line Items]
Credit receivable					$ 100