Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 14,382	$ 19,673
Work in process	3,924	1,985
Finished goods	18,952	18,987
Total inventories	37,258	$ 40,645
Decrease in inventories	$ (3,400)