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12. SEGMENT AND GEOGRAPHIC INFORMATION - Revenue (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Net revenues by geographic area        
Net revenues $ 8,065 $ 6,763 $ 24,653 $ 20,043
Number of reporting units | segment     1  
United States        
Net revenues by geographic area        
Net revenues 3,217 3,550 $ 11,659 9,363
China        
Net revenues by geographic area        
Net revenues 560 760 1,190 1,762
Singapore        
Net revenues by geographic area        
Net revenues 1,346 772 4,377 2,608
Netherlands        
Net revenues by geographic area        
Net revenues 1,441 951 3,889 4,083
Germany        
Net revenues by geographic area        
Net revenues 1,041 615 2,431 1,653
Rest of the world        
Net revenues by geographic area        
Net revenues $ 460 $ 115 $ 1,107 $ 574