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Balance Sheet Details Balance Sheet Details (Details 3) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventory [Line Items]    
Inventory, Raw Materials, Net of Reserves $ 2,583 $ 2,976
Inventory, Work in Process, Net of Reserves 145 1,109
Inventory, Finished Goods, Net of Reserves 4,044 1,074
Inventories $ 6,772 $ 5,159