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CONVERTIBLE SENIOR NOTES AND CAPPED CALL (Tables)
 12 Months Ended
Mar. 31, 2019
Debt Disclosure [Abstract]  
Convertible Debt
The net carrying amount of the liability component of the Notes was as follows (in thousands):
 
 
March 31, 2019
Principal
 
$
287,500

Unamortized debt discount
 
(70,876
)
Unamortized issuance costs
 
(589
)
Net carrying amount
 
$
216,035

The net carrying amount of the equity component of the Notes was as follows (in thousands):
 
 
March 31, 2019
Debt discount for conversion option
 
$
66,700

Issuance costs
 
(1,848
)
Net carrying amount
 
$
64,852

The net impact to the Company’s stockholders’ equity, included in additional paid-in capital, relating to the issuance of the Notes was as follows (in thousands):

 
 
March 31, 2019
Conversion option
 
$
66,700

Payments for capped call transactions
 
(33,724
)
Issuance costs
 
(1,848
)
Total
 
31,128
Interest Income and Interest Expense Disclosure
Interest expense related to the Notes was as follows (in thousands):
 
 
March 31, 2019
Contractual interest expense
 
$
156

Amortization of debt discount
 
1,343

Amortization of issuance costs
 
11

Total interest expense
 
$
1,510