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BALANCE SHEET DETAILS - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Inventories:    
Raw materials $ 2,362 $ 1,665
Work in process 1,285 2,992
Finished goods 2,495 21,731
Total Inventory $ 6,142 $ 26,388