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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

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+ 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

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