Inventory (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Inventory [Line Items]
Inventory, Work in Process, Gross	$ 2,406	$ 1,625
Inventory, Finished Goods, Gross	1,127	1,259
Inventory, Net	3,533	2,884
Deferred Costs and Other Assets	500	100
Inventory Write-down	$ 112	$ 300	$ 0