Restatement of Previously Issued Unaudited Interim Condensed Consolidated Financial Statements (Details 3) - 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]
Net loss	$ (13,119)	$ (919)	$ (17,921)	$ (88)
Comprehensive loss	(13,147)	$ (1,082)	(18,253)	$ (333)
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	(20,716)		(25,518)
Comprehensive loss	(20,744)		(25,850)
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	7,597		7,597
Comprehensive loss	$ 7,597		$ 7,597