Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Inventory [Line Items]
Inventory, Raw Materials, Gross	$ 24,727	$ 6,214
Deferred Costs and Other Assets	100	500
Inventory, Work in Process, Gross	3,700	549
Inventory, Finished Goods, Gross	11,346	12,179
Inventory, Net	39,773	18,942
Inventory Write-down	$ 300	$ 1,200	$ (2,000)