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7. FINANCIAL INSTRUMENTS - Available-for-sale investments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Available-for-sale investments
Cost	$ 15,453
Total	15,509
Short-term investments
Available-for-sale investments
Cost	9,679	$ 14,989
Gross Unrealized Gains	38	73
Gross Unrealized Losses		(1)
Total	9,717	15,061
Short-term investments | Certificates of deposit
Available-for-sale investments
Cost	1,495	12,000
Gross Unrealized Gains	13	52
Gross Unrealized Losses		(1)
Total	1,508	12,051
Short-term investments | Supranational obligations
Available-for-sale investments
Cost	2,273
Gross Unrealized Gains	1
Total	2,274
Short-term investments | Agency bonds
Available-for-sale investments
Cost	5,911	2,989
Gross Unrealized Gains	24	21
Total	5,935	3,010
Long-term investment
Available-for-sale investments
Cost	5,774	4,044
Gross Unrealized Gains	20	73
Gross Unrealized Losses	(2)
Total	5,792	4,117
Long-term investment | Certificates of deposit
Available-for-sale investments
Cost	3,750	745
Gross Unrealized Gains	19	18
Gross Unrealized Losses	(1)
Total	3,768	763
Long-term investment | Supranational obligations
Available-for-sale investments
Cost	1,023	1,270
Gross Unrealized Gains		13
Gross Unrealized Losses	(1)
Total	1,022	1,283
Long-term investment | Agency bonds
Available-for-sale investments
Cost	1,001	2,029
Gross Unrealized Gains	1	42
Total	$ 1,002	$ 2,071

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 50
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

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