Debt - Interest Income / (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Interest income	$ 59	$ (194)	$ 118	$ (648)
Amortization of debt discount and debt issuance costs			$ 0	251
Interest expense		194		648
Convertible notes
Debt Instrument [Line Items]
Interest expense, debt		131		397
Amortization of debt discount and debt issuance costs		$ 63		$ 251