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12. SEGMENT AND GEOGRAPHIC INFORMATION - Revenue (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($)
Net revenues by geographic area |  |  |  |
Net revenues | $ 6,763 | $ 10,049 | $ 20,043 | $ 34,808
Number of reporting units | segment |  |  | 1 |
United States |  |  |  |
Net revenues by geographic area |  |  |  |
Net revenues | 3,550 | 4,408 | $ 9,363 | 12,794
China |  |  |  |
Net revenues by geographic area |  |  |  |
Net revenues | 760 | 1,221 | 1,762 | 4,590
Singapore |  |  |  |
Net revenues by geographic area |  |  |  |
Net revenues | 772 | 766 | 2,608 | 5,538
Netherlands |  |  |  |
Net revenues by geographic area |  |  |  |
Net revenues | 951 | 417 | 4,083 | 5,169
Germany |  |  |  |
Net revenues by geographic area |  |  |  |
Net revenues | 615 | 2,958 | 1,653 | 5,870
Rest of the world |  |  |  |
Net revenues by geographic area |  |  |  |
Net revenues | $ 115 | $ 279 | $ 574 | $ 847

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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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