Stock-Based Compensation (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Beginning Balance	$ 6,756	$ 0
Warrants liability		7,376
Change in fair value of warrant liability	3,811	(620)	$ 0
Ending Balance	$ 10,567	$ 6,756	$ 0