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Debt - Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Debt Instrument [Line Items] |  |  |  |
Amortization of debt discount and debt issuance costs |  |  | $ 188 | $ 680
Interest expense | $ 135 | $ 662 | 454 | 1,369
Convertible notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense, net | 108 | 335 | 266 | 689
Amortization of debt discount and debt issuance costs | $ 27 | $ 327 | $ 188 | $ 680

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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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