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CONVERTIBLE SENIOR NOTES AND CAPPED CALL (Tables)
6 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Convertible Debt
The net carrying amount of the liability component of the Notes was as follows (in thousands):
 September 30, 2020March 31, 2020
Principal$362,500 $362,500 
Unamortized debt discount(61,786)(69,987)
Unamortized issuance costs(861)(976)
Net carrying amount$299,853 $291,537 
Schedule of Interest Income and Interest Expense Disclosure
Interest expense related to the Notes was as follows (in thousands):
 Three Months Ended September 30,Six Months Ended September 30,
2020201920202019
Contractual interest expense$453 $360 $906 $719 
Amortization of debt discount4,133 3,198 8,201 6,344 
Amortization of issuance costs58 27 115 53 
Total interest expense$4,644 $3,585 $9,222 $7,116