Restatement of Previously Issued Unaudited Interim Condensed Consolidated Financial Statements (Details 7) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues, net		$ 16,432		$ 34,095
Cost of revenues	$ 11,465	8,395	$ 20,790	15,124
Total costs and expenses	21,159	18,214	39,235	32,910
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues, net		18,408		38,299
Cost of revenues	11,728	10,371	21,053	19,328
Total costs and expenses	21,656	20,190	39,732	37,114
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues, net		1,976		4,204
Cost of revenues	(263)	1,976	(263)	4,204
Total costs and expenses	$ (497)	$ 1,976	$ (497)	$ 4,204