Summary of Significant Accounting Policies (Property) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Property and Equipment
Estimated useful life	P3Y
Gain (loss) from operations	$ (9,605)	$ (6,277)
Net loss	$ (8,685)	$ (10,004)
Decrease in net basic and diluted loss per share (in dollars per share)	$ (0.17)	$ (1.89)
Machinery and equipment | Change to estimated useful life
Property and Equipment
Estimated useful life	P5Y	P3Y
Gain (loss) from operations	$ 400
Decrease in net basic and diluted loss per share (in dollars per share)	$ 0.01	$ 0.01