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Stockholders' Equity - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  | 9 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Incentive_Plan | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Warrants Attached to Senior Convertible Debt [Member] | Mar. 31, 2013 Common Stock [Member] | Sep. 30, 2014 Common Stock [Member] | Dec. 31, 2013 Common Stock [Member] | Sep. 30, 2013 Common Stock [Member] | Jun. 03, 2010 Common Stock [Member] | Jan. 16, 2008 Common Stock [Member] | Aug. 17, 2007 Common Stock [Member] | Sep. 30, 2014 Common Stock [Member] Minimum [Member] | Aug. 17, 2007 Common Stock [Member] Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | 85,321,008 |  | 85,321,008 |  | 83,882,577 |  |  | 1,290,155 |  | 3,552,357 |  |  |  |  |
Common stock, shares value representing payment for principal | $ 8,532 |  | $ 8,532 |  | $ 8,388 |  |  | $ 2,420,863 |  | $ 9,280,242 |  |  |  |  |
Common shares issued from warrant conversion |  |  |  |  |  |  | 2,010,500 |  |  |  |  |  |  |  |
Warrants to purchase shares of common stock outstanding |  |  |  |  |  | 1,562,500 |  | 0 | 0 |  |  |  |  |  |
Warrants exercise price |  |  |  |  |  | $ 3.60 |  |  |  |  |  |  |  |  |
Warrants expiration date | Oct. 11, 2013 |  | Apr. 13, 2014 |  |  | Nov. 09, 2016 |  |  |  |  |  |  |  |  |
Number of stock incentive plans |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Stock incentive plan expiration date |  |  | Aug. 17, 2007 |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized for stock-based compensation |  |  |  |  |  |  |  |  |  |  | 3,000,000 | 2,500,000 | 2,500,000 |  | 500,000
Exercise price of incentive option granted |  |  |  |  |  |  |  | Exercise price of any incentive option granted to an officer, director or eligible employee owning more than 10% of our outstanding common stock must not be less than 110% of fair market value on the date of the grant. |  |  |  |  |  |  |
Eligible employee threshold percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
Purchase price of common stock percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 110.00% |
Share-based compensation | $ 607,106 | $ 882,933 | $ 1,827,767 | $ 2,123,706 |  |  |  |  |  |  |  |  |  |  |
Stock option, issued | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |

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