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CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Net Impact to Stockholders' Equity (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2019
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Debt Instrument [Line Items]        
Total     $ 3,094 $ 31,128
Convertible Debt | Additional Notes        
Debt Instrument [Line Items]        
Conversion option   $ 12,810    
Payments for capped call transactions $ (9,300) (9,288)    
Issuance costs   (436)    
Total   3,086    
Convertible Debt | Initial Notes        
Debt Instrument [Line Items]        
Conversion option   66,700    
Payments for capped call transactions $ (33,700) (33,724)    
Issuance costs   (1,848)    
Total   $ 31,128