Inventory (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Inventory [Line Items]
Inventories	$ 6,522		$ 6,522		$ 8,875
Cost of goods sold
Inventory [Line Items]
Inventory Write-down	$ 100	$ 100	$ 100	$ 100