Quarterly report pursuant to Section 13 or 15(d)

Debt - Interest Expense (Details)

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Debt - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Amortization of debt discount and debt issuance costs     $ 251 $ 875
Interest expense, total $ 194 $ 446 648 1,815
Convertible notes        
Debt Instrument [Line Items]        
Interest expense, debt 131 251 397 940
Amortization of debt discount and debt issuance costs $ 63 $ 195 $ 251 $ 875