Selected Balance Sheet Information (Details 2) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accrued Expenses [Line Items]
Accrued manufacturing costs	$ 1,069	$ 14
Accrued clinical consulting services	806	2,211
Accrued vendor payments	187	400
Other accrued expenses	8	2
Total	$ 2,070	$ 2,627