Restatement of Financial Statements (Details 5) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	$ (8,982)	$ (2,703)	$ (9,070)	$ (6,554)
Stockholders' equity	50,527		50,527		$ 56,667	[1]
Retained Earnings [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss			(9,070)
Stockholders' equity	(53,973)		(53,973)		$ (44,903)
Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	(6,328)		(6,416)
Stockholders' equity	53,181		53,181
Previously Reported | Retained Earnings [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' equity	(51,319)		(51,319)
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	(2,654)		(2,654)
Stockholders' equity	(2,654)		(2,654)
Adjustment | Retained Earnings [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' equity	$ (2,654)		$ (2,654)

[1] Derived from the audited December 31, 2016 financial statements