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Warrants and Derivative Liabilities (Tables) | 12 Months Ended
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Mar. 31, 2017
Exchanged warrants |
Class Of Warrant Or Right [Line Items] |
Summary of Key Assumptions Used to Calculate Fair Value | Following is a summary of the key assumptions used to calculate the fair value of the Exchanged Warrant:
| March 31, |  | December 31, |  | September 30, |  | June 30, |  |  |
Fiscal Year 16 | 2017 |  | 2016 |  | 2016 |  | 2016 |  |  |
Risk-free interest rate | 0.91% |  | 0.56% |  | 0.59% |  | 0.48% |  |  |
Expected annual dividend yield | — |  | — |  | — |  | — |  |  |
Expected volatility | 44.12% |  | 58.04% |  | 70.50% |  | 76.30% |  |  |
Term (years) | 0.51 |  | 0.76 |  | 1.01 |  | 1.26 |  |  |
Fair value | $— |  | $0.1 million |  | $0.2 million |  | $0.4 million |  |  |
| March 31, |  | December 31, |  | September 30, |  | June 30, |  |  |
Fiscal Year 15 | 2016 |  | 2015 |  | 2015 |  | 2015 |  |  |
Risk-free interest rate | 0.66% |  | 0.96% |  | 0.64% |  | 0.74% |  |  |
Expected annual dividend yield | — |  | — |  | — |  | — |  |  |
Expected volatility | 76.76% |  | 76.68% |  | 73.39% |  | 71.61% |  |  |
Term (years) | 1.51 |  | 1.76 |  | 2.01 |  | 2.26 |  |  |
Fair value | $0.4 million |  | $0.3 million |  | $0.1 million |  | $0.2 million |  |  |
| March 31, |  | December 31, |  | September 30, |  | June 30, |  | March 31, |
Fiscal Year 14 | 2015 |  | 2014 |  | 2014 |  | 2014 |  | 2014 |
Risk-free interest rate | 0.73% |  | 1.00% |  | 1.07% |  | 0.98% |  | 1.11% |
Expected annual dividend yield | — |  | — |  | — |  | — |  | — |
Expected volatility | 70.42% |  | 72.38% |  | 76.20% |  | 83.50% |  | 80.99% |
Term (years) | 2.51 |  | 2.76 |  | 3.01 |  | 3.26 |  | 3.51 |
Fair value | $0.3 million |  | $0.5 million |  | $1.5 million |  | $2.3 million |  | $2.2 million |
Hercules warrant |
Class Of Warrant Or Right [Line Items] |
Summary of Key Assumptions Used to Calculate Fair Value | Following is a summary of the key assumptions used to calculate the fair value of the Hercules Warrant:
| March 31, |  | December 31, |  | September 30, |  | June 30,
Fiscal Year 16 | 2017 |  | 2016 |  | 2016 |  | 2016
Risk-free interest rate | 1.55% |  | 1.57% |  | 0.97% |  | 0.86%
Expected annual dividend yield | — |  | — |  | — |  | —
Expected volatility | 66.51% |  | 67.28% |  | 67.98% |  | 68.34%
Term (years) | 3.25 |  | 3.50 |  | 3.75 |  | 4.00
Fair value | $0.2 million |  | $0.2 million |  | $0.2 million |  | $0.3 million
| March 31, |  | December 31, |  | September 30, |  | June 30,
Fiscal Year 15 | 2016 |  | 2015 |  | 2015 |  | 2015
Risk-free interest rate | 1.08% |  | 1.65% |  | 1.31% |  | 1.63%
Expected annual dividend yield | — |  | — |  | — |  | —
Expected volatility | 70.25% |  | 73.57% |  | 75.32% |  | 72.57%
Term (years) | 4.25 |  | 4.50 |  | 4.75 |  | 5.00
Fair value | $0.2 million |  | $0.2 million |  | $0.1 million |  | $0.2 million
|  |  |  |  | New Issuance |  |
| March 31, |  | December 31, |  | December 19, |  |
Fiscal Year 14 | 2015 |  | 2014 |  | 2014 |  |
Risk-free interest rate | 1.41% |  | 1.73% |  | 1.74% |  |
Expected annual dividend yield | — |  | — |  | — |  |
Expected volatility | 74.60% |  | 77.43% |  | 70.26% |  |
Term (years) | 5.25 |  | 5.50 |  | 5.53 |  |
Fair value | $0.2 million |  | $0.2 million |  | $0.2 million |  |
November 2014 warrant |
Class Of Warrant Or Right [Line Items] |
Summary of Key Assumptions Used to Calculate Fair Value | Following is a summary of the key assumptions used to calculate the fair value of the November 2014 Warrant:
| March 31, |  | December 31, |  | September 30, |  | June 30,
Fiscal Year 16 | 2017 |  | 2016 |  | 2016 |  | 2016
Risk-free interest rate | 1.41% |  | 1.43% |  | 0.93% |  | 0.77%
Expected annual dividend yield | — |  | — |  | — |  | —
Expected volatility | 66.53% |  | 69.31% |  | 68.96% |  | 70.01%
Term (years) | 2.62 |  | 2.87 |  | 3.12 |  | 3.37
Fair value | $1.8 million |  | $2.3 million |  | $2.3 million |  | $3.2 million
| March 31, |  | December 31, |  | September 30, |  | June 30,
Fiscal Year 15 | 2016 |  | 2015 |  | 2015 |  | 2015
Risk-free interest rate | 0.98% |  | 1.51% |  | 1.17% |  | 1.44%
Expected annual dividend yield | — |  | — |  | — |  | —
Expected volatility | 69.88% |  | 70.02% |  | 73.02% |  | 74.18%
Term (years) | 3.62 |  | 3.87 |  | 4.12 |  | 4.37
Fair value | $2.6 million |  | $2.1 million |  | $1.3 million |  | $1.8 million
|  |  |  |  | New Issuance |  |
| March 31, |  | December 31, |  | November 13, |  |
Fiscal Year 14 | 2015 |  | 2014 |  | 2014 |  |
Risk-free interest rate | 1.28% |  | 1.61% |  | 1.64% |  |
Expected annual dividend yield | — |  | — |  | — |  |
Expected volatility | 75.96% |  | 78.00% |  | 72.86% |  |
Term (years) | 4.62 |  | 4.87 |  | 5.00 |  |
Fair value | $2.5 million |  | $3.2 million |  | $4.3 million |  |

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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