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Inventory (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Inventory Disclosure [Abstract]      
Raw materials $ 788   $ 626
Work in process 1,153   1,054
Finished goods 983   543
Total 2,924   $ 2,223
Inventory write-off $ 134 $ (7)