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7. FINANCIAL INSTRUMENTS - Available-for-sale investments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Mar. 31, 2020
Available-for-sale investments
Cost	$ 19,243
Total	19,322
Short-term investments
Available-for-sale investments
Cost	9,178	$ 14,989
Gross Unrealized Gains	19	73
Gross Unrealized Losses	(1)	(1)
Total	9,196	15,061
Short-term investments | Certificates of deposit
Available-for-sale investments
Cost	2,495	12,000
Gross Unrealized Gains	14	52
Gross Unrealized Losses		(1)
Total	2,509	12,051
Short-term investments | Supranational obligations
Available-for-sale investments
Cost	2,765
Gross Unrealized Gains	5
Total	2,770
Short-term investments | Agency bonds
Available-for-sale investments
Cost	3,918	2,989
Gross Unrealized Gains		21
Gross Unrealized Losses	(1)
Total	3,917	3,010
Long-term investment
Available-for-sale investments
Cost	10,065	4,044
Gross Unrealized Gains	62	73
Gross Unrealized Losses	(1)
Total	10,126	4,117
Long-term investment | Certificates of deposit
Available-for-sale investments
Cost	4,000	745
Gross Unrealized Gains	31	18
Total	4,031	763
Long-term investment | Supranational obligations
Available-for-sale investments
Cost	2,047	1,270
Gross Unrealized Gains		13
Gross Unrealized Losses	(1)
Total	2,046	1,283
Long-term investment | Agency bonds
Available-for-sale investments
Cost	4,018	2,029
Gross Unrealized Gains	31	42
Total	$ 4,049	$ 2,071

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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