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Stockholders' Equity - Additional Information (Detail) - $ / shares | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | ---
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 | 59,627,499 | 59,544,677
Preferred stock, shares outstanding | 15,652 | 15,652
Threshold percentage of common stock ownership upon preferred stock conversion | 9.99% |
Series C Preferred Stock |  |
Class Of Stock [Line Items] |  |
Common stock, issued upon conversion of preferred stock | 2,670,990 |
Preferred stock, shares outstanding | 15,652 |
2004 Equity Incentive Plan, 2013 Equity Incentive Plan, and Inducement Grants |  |
Class Of Stock [Line Items] |  |
Common Stock, Share reserve for issuance | 7,945,090 |

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- Definition Number of authorized capital units or capital shares. This element is relevant to issuers of face-amount certificates and registered investment companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.16(a)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 + Details
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