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BALANCE SHEET COMPONENTS Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Inventory      
Work in process inventory   $ 15,296 $ 2,535
Batteries   5,547 1,045
Total inventory $ 22,309 $ 20,843 $ 3,580