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BALANCE SHEET DETAILS - Inventory (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]          
Raw materials $ 4,640   $ 4,640   $ 4,923
Work in process 1,522   1,522   785
Finished goods 2,714   2,714   3,132
Inventory 8,876   8,876   $ 8,840
Inventory write-downs $ 100 $ 100 $ 200 $ 400