Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Inventory [Line Items]
Deferred Costs and Other Assets	$ 100
Inventory, Work in Process, Gross	1,625
Inventory, Finished Goods, Gross	1,259
Inventory, Net	2,884	$ 0
Inventory Write-down	$ 342	$ 0	$ 0