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Fair Value Measurements - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) shares | Mar. 31, 2016 USD ($) | Mar. 31, 2017 USD ($) shares | Mar. 31, 2016 USD ($) | Sep. 30, 2011 shares | Jan. 31, 2013 shares | Dec. 31, 2012 shares
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Warrants outstanding | 527,181 |  | 527,181 |  |  |  |
Fair value | $ | $ 24,780,173 |  | $ 24,780,173 |  |  |  |
Level 1 | Corporate Bonds |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value | $ | $ 24,780,173 |  | $ 24,780,173 |  |  |  |
Ablaris Therapeutics |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Warrants outstanding | 500,000 |  | 500,000 |  |  |  |
Duration of exchange rights |  |  | 7 years |  |  |  |
Exchange right convertible conversion ratio |  |  | 0.01 |  |  |  |
Number of exchange right sold |  |  |  |  | 675,000 |  |
Exchange rights |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Non-cash gain (loss) from change in fair value of the derivative liability | $ |  |  | $ 27,500 |  |  |  |
Exchange rights | Ablaris Therapeutics |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Non-cash gain (loss) from change in fair value of the derivative liability | $ | $ (1,500) | $ 6,650 | $ 27,500 | $ 4,700 |  |  |
2012 Warrants |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Warrants issued to acquire Common Stock |  |  |  |  |  |  | 912,543
Warrants outstanding | 265,161 |  | 265,161 |  |  |  |
2013 Warrants |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Warrants issued to acquire Common Stock |  |  |  |  |  | 833,530 |
Warrants outstanding | 12,123 |  | 12,123 |  |  |  |
Warrant |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Non-cash gain (loss) from change in fair value of the derivative liability | $ | $ (25,883) | $ 363,285 | $ 1,428,948 | $ 341,711 |  |  |

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