Fair Value Measurements Rollforward of derivative liability for conversion feature (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Dec. 31, 2016	May 19, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative Liability		$ 549	$ 403	$ 11,574
Mark-to-market adjustment on conversion feature	[1]	$ 146

[1] Mark-to-market adjustment is recognized in unrealized loss on embedded debt conversion option in the Condensed Consolidated Statements of Operations and Comprehensive Loss for the three months ended March 31, 2017.