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Balance Sheet Account Details (Schedule of Inventory) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Work-in-process $ 1,129 $ 1,907
Finished goods 781 113
Total inventory, net $ 1,910 $ 2,020