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Warrants and Derivative Liabilities (Tables) | 6 Months Ended
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Sep. 30, 2018
November 2014 Warrant |
Class Of Warrant Or Right [Line Items] |
Schedule of Assumptions Used to Calculate the Fair Value of Warrants | Following is a summary of the key assumptions used to calculate the fair value of the November 2014 Warrant:
Fiscal Year 18 | September 30, 2018 | June 30, 2018
Risk-free interest rate | 2.62% | 2.40%
Expected annual dividend yield | — | —
Expected volatility | 63.66% | 67.40%
Term (years) | 1.12 | 1.37
Fair value | $1.3 million | $1.6 million
Fiscal Year 17 | March 31, 2018 |  | December 31, 2017 |  | September 30, 2017 |  | June 30, 2017 |  | March 31, 2017
Risk-free interest rate | 2.20% |  | 1.87% |  | 1.49% |  | 1.44% |  | 1.41%
Expected annual dividend yield | — |  | — |  | — |  | — |  | —
Expected volatility | 65.86% |  | 65.86% |  | 65.64% |  | 67.21% |  | 66.53%
Term (years) | 1.62 |  | 1.87 |  | 2.12 |  | 2.37 |  | 2.62
Fair value | $1.1 million |  | $0.4 million |  | $0.8 million |  | $0.9 million |  | $1.8 million

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