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Balance Sheet Components - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw material $ 1,915 $ 1,084
Work in progress 1,103 634
Finished goods 2,643 2,313
Consigned inventory 1,353 1,100
Total inventory $ 7,014 $ 5,131