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Subsequent Events - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended |  |  | 0 Months Ended | 1 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2013 | Jan. 31, 2013 | Dec. 31, 2012 | Aug. 10, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Oct. 21, 2011 | Oct. 11, 2013 Subsequent Event | Oct. 31, 2013 Subsequent Event | Oct. 11, 2013 Subsequent Event Common Stock | Oct. 11, 2013 Subsequent Event Series C Preferred Stock
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance and sold of stock |  | 1,667,051 | 1,825,079 | 2,260,869 |  |  |  |  |  | 3,071,672 | 46,000
Common stock, par value |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  | $ 5.86 |
Sale of stock, price per share |  | $ 2.12 | $ 2.26 | $ 2.76 |  |  |  |  |  |  | $ 1,000
Conversion price | $ 1.83 |  |  |  |  |  |  | $ 5.86 |  |  |
Aggregate price of issuance or Sale of Equity |  |  |  |  |  |  |  | $ 64 |  |  |
Cash from issuance of equity | $ 36.0 |  |  |  | $ 44.5 |  |  | $ 60.0 | $ 60.0 |  |

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- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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