Inventory (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Raw materials		$ 56,962	$ 31,354
Work-in-progress		12,033	21,487
Finished goods		1,903	11,743
Total		70,898	64,584
Inventory write-down, obsolescence	$ 16,700	$ 8,500	29,500
Inventory write-down, market conditions	$ 15,700		$ 12,100