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7. FINANCIAL INSTRUMENTS - Unrealized losses and fair value (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Mar. 31, 2021
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Fair Value |  |
Less Than 12 Months, Fair Value | $ 9,912 | $ 3,536
12 Months or Greater, Fair Value | 249 |
Total, Fair Value | 10,161 | 3,536
Unrealized Loss |  |
Less Than 12 Months, Unrealized Loss | (12) | (2)
12 Months or Greater, Unrealized Loss | (1) |
Total, Unrealized Loss | (13) | (2)
Certificates of deposit |  |
Fair Value |  |
Less Than 12 Months, Fair Value | 5,244 | 1,499
12 Months or Greater, Fair Value | 249 |
Total, Fair Value | 5,493 | 1,499
Unrealized Loss |  |
Less Than 12 Months, Unrealized Loss | (6) | (1)
12 Months or Greater, Unrealized Loss | (1) |
Total, Unrealized Loss | (7) | (1)
Agency bonds |  |
Fair Value |  |
Less Than 12 Months, Fair Value | 3,009 |
Total, Fair Value | 3,009 |
Unrealized Loss |  |
Less Than 12 Months, Unrealized Loss | (3) |
Total, Unrealized Loss | (3) |
Supranational obligations |  |
Fair Value |  |
Less Than 12 Months, Fair Value | 1,659 | 2,037
Total, Fair Value | 1,659 | 2,037
Unrealized Loss |  |
Less Than 12 Months, Unrealized Loss | (3) | (1)
Total, Unrealized Loss | $ (3) | $ (1)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 + Details
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