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CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Interest Expense (Details) - Convertible Debt - Aggregate Notes - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Contractual interest expense	$ 400	$ 1,119
Amortization of debt premium	(31)	0
Amortization of debt discount	3,582	9,926
Amortization of issuance costs	40	92
Total interest expense	$ 3,991	$ 11,137

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Amortization of Debt Discount

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Amount of amortization expense attributable to debt issuance costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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