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Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |
Fair Value Measurements for Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table summarizes fair value measurements at March 31, 2017 and September 30, 2016 for assets and liabilities measured at fair value on a recurring basis: March 31, 2017:
| Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash and cash equivalents | $ | 61,718,971 |  |  | $ | — |  |  | $ | — |  |  | $ | 61,718,971 |
Short-term investments | $ | 24,910,492 |  |  | $ | — |  |  | $ | — |  |  | $ | 24,910,492 |
Derivative liabilities | $ | — |  |  | $ | — |  |  | $ | 146,178 |  |  | $ | 146,178 |
September 30, 2016:
| Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash and cash equivalents | $ | 85,366,448 |  |  | $ | — |  |  | $ | — |  |  | $ | 85,366,448 |
Short-term investments | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Derivative liabilities | $ | — |  |  | $ | — |  |  | $ | 1,602,626 |  |  | $ | 1,602,626 |
Exchange rights |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |
Assumptions Used in Valuing Derivative Liabilities | The assumptions used in valuing the derivative liability were as follows:
| March 31, 2017 |  |  | September 30, 2016
Risk-free interest rate | 1.03% |  |  | 0.68%
Expected life | 0.9 Years |  |  | 1.5 Years
Dividend yield | — |  |  | —
Volatility | 79% |  |  | 89%
Reconciliation of Derivative Liability | The following is a reconciliation of the derivative liability related to these exchange rights:
Value at September 30, 2016 | $ | 36,752 |
Issuance of instruments |  | — |
Change in value |  | (27,500 | )
Net settlements |  | — |
Value at March 31, 2017 | $ | 9,252 |
Warrant |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |
Assumptions Used in Valuing Derivative Liabilities | The assumptions used in valuing the derivative liability were as follows:
2012 Warrants |  | March 31, 2017 |  |  | September 30, 2016 |
Risk-free interest rate |  | 1.03% |  |  | 0.68% |
Expected life |  | 0.7 Years |  |  | 1.2 Years |
Dividend yield |  | — |  |  | — |
Volatility |  | 79% |  |  | 89% |
2013 Warrants |  | March 31, 2017 |  |  | September 30, 2016 |
Risk-free interest rate |  | 1.03% |  |  | 0.68% |
Expected life |  | 0.8 Years |  |  | 1.3 Years |
Dividend yield |  | — |  |  | — |
Volatility |  | 79% |  |  | 89% |
Reconciliation of Derivative Liability | The following is a reconciliation of the derivative liability related to these warrants:
Value at September 30, 2016 | $ | 1,565,874 |
Issuance of instruments |  | — |
Change in value |  | (1,428,948 | )
Net settlements |  | — |
Value at March 31, 2017 | $ | 136,926 |

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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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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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