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7. FINANCIAL INSTRUMENTS - Unrealized losses and fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Mar. 31, 2020
Fair Value    
Less Than 12 Months, Fair Value $ 7,691 $ 2,498
Total, Fair Value 7,691 2,498
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 3 2
Total, Unrealized Loss 3 2
Certificates of deposit    
Fair Value    
Less Than 12 Months, Fair Value 250 2,498
Total, Fair Value 250 2,498
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 1 2
Total, Unrealized Loss 1 $ 2
Agency bonds    
Fair Value    
Less Than 12 Months, Fair Value 4,918  
Total, Fair Value 4,918  
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 1  
Total, Unrealized Loss 1  
Supranational obligations    
Fair Value    
Less Than 12 Months, Fair Value 2,523  
Total, Fair Value 2,523  
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 1  
Total, Unrealized Loss $ 1