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13. SEGMENT AND GEOGRAPHIC INFORMATION - Revenue (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
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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

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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