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CONVERTIBLE SENIOR NOTES AND CAPPED CALL (Tables)
 12 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]  
Convertible Debt
The net impact to the Company’s stockholders’ equity, included in additional paid-in capital, relating to the issuance of the Initial and Additional Notes was as follows (in thousands):
 
 
Additional Notes
 
Initial Notes
Conversion option
 
$
12,810

 
$
66,700

Payments for capped call transactions
 
(9,288
)
 
(33,724
)
Issuance costs
 
(428
)
 
(1,848
)
Total
 
$
3,094

 
$
31,128


The net carrying amount of the liability component of the Notes were as follows (in thousands):
 
 
March 31, 2020
 
March 31, 2019
Principal
 
$
362,500

 
$
287,500

Unamortized debt discount
 
(69,987
)
 
(70,876
)
Unamortized issuance costs
 
(976
)
 
(589
)
Net carrying amount
 
$
291,537

 
$
216,035
Interest Income and Interest Expense Disclosure
The following table sets forth total interest expense recognized related to the Notes (in thousands):
 
 
Years Ended March 31,
 
 
2020
 
2019
Contractual interest expense
 
$
1,572

 
$
156

Amortization of debt discount
 
13,901

 
1,343

Amortization of issuance costs
 
145

 
11

Total interest expense
 
$
15,618

 
$
1,510