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Balance Sheets Components - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 1,619 $ 435
Work in progress 13,567 10,184
Finished goods 3,308 1,731
Total inventories $ 18,494 $ 12,350