Summary of Significant Accounting Policies - Property (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Property and Equipment
Estimated useful life			P3Y
Gain (loss) from operations	$ (26,655)	$ (20,741)	$ (58,775)	$ (42,490)
Net loss	$ 26,017	$ 17,630	$ 57,858	$ 47,315
Increase in net basic and diluted loss per share (in dollars per share)	$ 0.50	$ 0.39	$ 1.13	$ 2.53
Machinery and equipment | Change to estimated useful life
Property and Equipment
Gain (loss) from operations	$ (400)		$ (400)
Net loss	$ 400		$ 400
Increase in net basic and diluted loss per share (in dollars per share)	$ 0.01		$ 0.01