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13. SEGMENT AND GEOGRAPHIC INFORMATION - Revenue (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2021
USD ($)
segment
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Net revenues by geographic area                      
Net revenues $ 7,686 $ 6,763 $ 6,659 $ 6,621 $ 8,535 $ 10,049 $ 11,740 $ 13,019 $ 27,729 $ 43,343 $ 51,486
Number of reporting units | segment                 1    
United States                      
Net revenues by geographic area                      
Net revenues                 $ 12,375 17,505 19,327
China                      
Net revenues by geographic area                      
Net revenues                 2,454 6,079 4,458
Singapore                      
Net revenues by geographic area                      
Net revenues                 4,074 6,556 7,592
Netherlands                      
Net revenues by geographic area                      
Net revenues                 5,555 5,463 11,093
Germany                      
Net revenues by geographic area                      
Net revenues                 2,395 6,604 7,478
Rest of the world                      
Net revenues by geographic area                      
Net revenues                 $ 876 $ 1,136 $ 1,538