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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Operating loss carryforwards, expiration dates | Mar. 31, 2029 |  |
Accrued penalties and interest | $ 0.0 | $ 0.0 | $ 0.0
Federal |  |  |
Operating Loss Carryforwards | 157.6 |  |
Research Tax Credit Carryforwards | $ 7.2 |  |
Research Tax Credit Carryforwards, Expiration Dates | Mar. 31, 2021 |  |
State |  |  |
Operating Loss Carryforwards | $ 27.5 |  |
Research Tax Credit Carryforwards | $ 9.1 |  |

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