Summary of Significant Accounting Policies - Property (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property and Equipment
Estimated useful life									P3Y
Gain (loss) from operations									$ (96,488)	$ (59,838)	$ 665
Increase (decrease) in net loss	$ 37,907	$ 26,017	$ 23,156	$ 8,685	$ 22,960	$ 17,630	$ 19,681	$ 10,004	$ 95,765	$ 70,275	$ 5,152
Increase (decrease) in basic and diluted loss per share (in dollars per share)	$ 0.72	$ 0.50	$ 0.46	$ 0.17	$ 0.47	$ 0.39	$ 3.58	$ 1.89	$ 1.86	$ 2.68	$ 1.07
Impairment of assets									$ 2,138	$ 1,557
Machinery and equipment
Property and Equipment
Estimated useful life							P3Y
Impairment of assets									2,100
Machinery and equipment | Change to estimated useful life
Property and Equipment
Estimated useful life							P5Y
Increase (decrease) in net loss									$ 1,700	$ (1,700)
Increase (decrease) in basic and diluted loss per share (in dollars per share)									$ 0.04	$ (0.07)