Restatement of Financial Statements (Details 4) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	$ (8,982)	$ (2,703)	$ (9,070)	$ (6,554)
Comprehensive loss	(8,604)	$ (2,985)	(8,937)	$ (7,546)
Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	(6,328)		(6,416)
Comprehensive loss	(5,950)		(6,283)
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	(2,654)		(2,654)
Comprehensive loss	$ (2,654)		$ (2,654)