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Stockholders' Equity - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 116 Months Ended |  |  |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  | 1 Months Ended
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Aug. 10, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Dec. 31, 2012 | Sep. 30, 2012 | Oct. 21, 2011 | Dec. 31, 2012 2000 Stock Option Plan [Member] | Dec. 31, 2012 2004 Equity Incentive Plan [Member] | Feb. 29, 2012 Series A Preferred Stock [Member] | Oct. 31, 2011 Series A Preferred Stock [Member] | Dec. 31, 2012 Series A Preferred Stock [Member] | Oct. 24, 2011 Series A Preferred Stock [Member] | Oct. 31, 2011 Common Stock [Member] | Dec. 31, 2012 Common Stock [Member] | Sep. 30, 2012 Common Stock [Member] | Sep. 30, 2011 Common Stock [Member] | Sep. 30, 2010 Common Stock [Member] | Sep. 30, 2005 Common Stock [Member] | Oct. 21, 2011 Common Stock [Member] | Sep. 30, 2012 Limited liability company [Member] | Oct. 31, 2011 Subscription Agreement [Member] | Oct. 31, 2011 Subscription Agreement [Member] Series A Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital stock authorized for issuance |  | 150,000,000 |  |  | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 145,000,000 |  |  | 145,000,000 | 145,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value |  | $ 0.001 |  |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  | 5,000,000 |  |  | 5,000,000 | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value |  | $ 0.001 |  |  | $ 0.001 | $ 0.001 |  |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  | 15,644,158 |  |  | 15,644,158 | 13,579,185 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  | 0 |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share reserve for issuance |  |  |  |  |  |  |  | 2,369,960 | 2,369,960 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum equity commitment amount under agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |
Equity commitment agreement period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36 months |  |
Cash drawn from facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |
Issuance and sold of Common Stock | 2,260,869 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,825,079 | 15,511 | 8,656 | 225,189 | 1,250 |  |  | 675,000 | 1,015
Sale of stock, price per share | $ 2.76 |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  | $ 2.26 |  |  |  |  | $ 3.70 |  |  |
Aggregate purchase price of preferred shares |  |  |  | (1,618,509) |  |  |  |  |  |  | 1,015,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares converted in common stock |  |  |  |  |  |  |  |  |  |  |  | 1,015 |  |  |  |  |  |  |  |  |  |  |
Preferred stock converted to common stock, shares |  |  |  |  |  |  |  |  |  | 275,782 |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price on issuance of common stock to be received |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,497,500 |  |  |  |  |  |  |  |  |
Warrant to purchase common stock | 0.75 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50 |  |  |  |  |  |  |  |
Proceeds from issuance of common stock and warrants, net | $ 6,200,000 | $ 3,332,467 | $ 1,463,833 |  | $ 109,585,478 |  |  |  |  |  |  |  |  |  | $ 4,100,000 |  |  |  |  |  |  |  |
Common stock exercise price | $ 3.25 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.20 |  |  |  |  |  |  |  |
Reverse stock split |  | Company effected a 1 for 10 reverse stock split |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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