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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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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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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

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