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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

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