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7. FINANCIAL INSTRUMENTS - Unrealized losses and fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Mar. 31, 2021
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)