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Stockholders' Equity - Additional Information (Detail) - USD ($) | Feb. 24, 2014 | Oct. 11, 2013 | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | --- | --- | ---
Class Of Stock [Line Items] |  |  |  |
Capital stock authorized for issuance |  |  | 150,000,000 |
Common stock, shares authorized |  |  | 145,000,000 | 145,000,000
Common stock, par value |  |  | $ 0.001 | $ 0.001
Preferred stock, shares authorized |  |  | 5,000,000 | 5,000,000
Preferred stock, par value |  |  | $ 0.001 | $ 0.001
Common stock, shares outstanding |  |  | 59,544,677 | 54,656,936
Preferred stock, shares outstanding |  |  | 15,652 | 18,300
Threshold percentage of common stock ownership upon preferred stock conversion |  |  | 9.99% |
Stock issuances, Shares | 6,325,000 | 3,071,672 |  |
Sale of stock, price per share | $ 18.95 | $ 5.86 |  |
Aggregate price on issuance or Sale of equity |  | $ 64,000,000 |  |
Proceeds from issuance of common stock, net | $ 112,600,000 | $ 60,000,000 |  |
Series C Preferred Stock |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Common stock equivalent of preferred stock |  |  | 2,670,990 |
Preferred stock, shares outstanding |  |  | 15,652 |
Stock issuances, Shares |  | 46,000 |  |
Sale of stock, price per share |  | $ 1,000 |  |
Conversion price |  | $ 5.86 |  |
2004 Equity Incentive Plan, 2013 Equity Incentive Plan, and Inducement Grants |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Common Stock, Share reserve for issuance |  |  | 8,099,777 |

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