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Warrants and Derivative Liabilities | 12 Months Ended
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Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Warrants and Derivative Liabilities | Warrants and Derivative Liabilities Senior Convertible Note Warrant On April 4, 2012, the Company entered into the Purchase Agreement with CVI. The Purchase Agreement included a warrant to purchase 309,406 shares of the Company’s common stock (the “Original Warrant”). Pursuant to an exchange in October 2013, the Original warrant was exchanged for a new warrant (the “Exchanged Warrant”). The Exchanged Warrant is exercisable at any time on or after the date that is six months after the issuance of the Original Warrant and entitles CVI to purchase shares of the Company’s common stock for a period of five years from the date the Original Warrant becomes exercisable at an exercise price equal to $15.70 per share, after giving effect to certain price-based and other anti-dilution adjustments including the sale of common stock under the ATM entered into in January 2017. See Note 12, "Stockholders Equity" for further discussion. The Exchanged Warrant may not be exercised if, after giving effect to the conversion, CVI together with its affiliates, would beneficially own in excess of 4.99% of the Company’s common stock. This percentage may be raised to any other percentage not in excess of 9.99% at the option of CVI, upon at least 61-days prior notice to the Company, or lowered to any other percentage, at the option of CVI, at any time. The Company calculated the fair value of the warrant, utilizing an integrated lattice model. The lattice model is an option pricing model that involves the construction of a binomial tree to show the different paths that the underlying asset may take over the option’s life. A lattice model can take into account expected changes in various parameters such as volatility over the life of the options, providing more accurate estimates of option prices than the Black-Scholes model. See Note 3, “Fair Value Measurements” for further discussion The Company accounts for the Exchanged Warrant as a liability due to certain adjustment provisions within the warrant, which requires that it be recorded at fair value. The Exchanged Warrant is subject to revaluation at each balance sheet date and any change in fair value is recorded as a change in fair value of derivatives and warrants until the earlier of its expiration or its exercise at which time the warrant liability will be reclassified to equity. 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 |
The Company recorded a net gain, resulting from the decrease in the fair value of the Exchanged Warrant, of $0.4 million in the fiscal year ended March 31, 2017. The Company recorded a net loss, resulting from an increase in the fair value of the Exchanged Warrant, of $0.1 million, and a net gain, of $1.9 million to change in fair value of derivatives and warrants in the fiscal years ended March 31, 2016 and 2015, respectively. Hercules Warrant On December 19, 2014, the Company entered into the Hercules Second Amendment, (see Note 10, “Debt” for additional information). In conjunction with the agreement, the Company issued the Hercules Warrant to purchase 58,823 shares of the Company’s common stock. The Hercules Warrant is exercisable at any time after its issuance at an exercise price of $9.38 per share, subject to certain price-based and other anti-dilution adjustments, including sales of common stock under the ATM entered into in January 2017, and expires on June 30, 2020. See Note 12, "Stockholders Equity" for further discussion. The Company accounts for the Hercules Warrant as a liability due to certain provisions within the warrant. The Hercules Warrant is subject to revaluation at each balance sheet date and any change in fair value is recorded as a change in fair value of derivatives and warrants until the earlier of its expiration or its exercise, at which time the warrant liability will be reclassified to equity. 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 |  |
The Company recorded no significant change, in the fair value of the Hercules Warrant in the fiscal years ended March 31, 2017, 2016 and 2015, respectively. November 2014 Warrant On November 13, 2014, the Company completed an offering of approximately 909,090 units of the Company’s common stock with Hudson Bay Capital. Each unit consisted of one share of the Company’s common stock and 0.9 of a warrant to purchase one share of common stock, or a warrant to purchase in the aggregate 818,181 shares (the “November 2014 Warrant”). The November 2014 Warrant is exercisable at any time, at an exercise price equal to $9.33 per share, subject to certain price-based and other anti-dilution adjustments, including sales of common stock under the ATM entered into in January 2017, and expires on November 13, 2019. See Note 12, "Stockholders Equity" for further discussion. The Company accounts for the November 2014 Warrant as a liability due to certain provisions within the warrant. The November 2014 Warrant is subject to revaluation at each balance sheet date and any change in fair value is recorded as a change in fair value of derivatives and warrants until the earlier of its expiration or its exercise, at which time the warrant liability will be reclassified to equity. 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 |  |
The Company recorded a net gain, resulting from a decrease in the fair value of the November 2014 Warrant, of $0.8 million, a net loss, resulting from an increase in the fair value of the November 2014 Warrant, of $0.1 million, and a net gain, of $1.8 million to change in fair value of derivatives and warrants in the fiscal years ended March 31, 2017, 2016 and 2015, respectively. The Company prepared its estimates for the assumptions used to determine the fair value of the warrants issued in conjunction with both the Exchanged Note, the Term Loans, and the November 2014 Warrant utilizing the respective terms of the warrants with similar inputs, as described above.

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