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CONVERTIBLE SENIOR NOTES AND CAPPED CALL (Tables)
 9 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Convertible Debt The net carrying amount of the liability component of the Notes was as follows (in thousands):
 
 
December 31, 2019
 
March 31, 2019
Principal
 
$
362,500

 
$
287,500

Unamortized premium
 
1,323

 
—

Unamortized debt discount
 
(75,315
)
 
(70,876
)
Unamortized issuance costs
 
(1,043
)
 
(589
)
Net carrying amount
 
$
287,465

 
$
216,035
Interest Income and Interest Expense Disclosure Interest expense related to the Notes was as follows (in thousands):
 
 
Three Months Ended
 
Nine Months Ended
 
 
December 31, 2019
 
December 31, 2019
Contractual interest expense
 
$
400

 
$
1,119

Amortization of debt premium
 
(31
)
 
—

Amortization of debt discount
 
3,582

 
9,926

Amortization of issuance costs
 
40

 
92

Total interest expense
 
$
3,991

 
$
11,137