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Stockholders' Equity - Additional Information (Detail) (USD $) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Jun. 03, 2010 | Jan. 16, 2008 | Aug. 17, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares issued | 83,939,140 |  | 83,882,577 |  |  |
Common stock, shares value representing payment for principal | $ 8,394 |  | $ 8,388 |  |  |
Warrants outstanding | 2,087,500 |  |  |  |  |
Warrants expiration date | Oct. 11, 2013 |  |  |  |  |
Number of stock incentive plans | 1 |  |  |  |  |
Stock incentive plan expiration date | Aug. 17, 2007 |  |  |  |  |
Share-based compensation | 492,775 | 688,580 |  |  |  |
Weighted average estimated fair value of stock options | $ 1.28 | $ 1.44 |  |  |  |
Warrants Attached to Senior Convertible Debt [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Warrants outstanding | 1,562,500 |  |  |  |  |
Warrants conversion price | $ 3.60 |  |  |  |  |
Warrants expiration date | Nov. 09, 2016 |  |  |  |  |
Warrants Attached to Series G Preferred Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Warrants outstanding | 525,000 |  |  |  |  |
Warrants conversion price | $ 2.44 |  |  |  |  |
Warrants expiration date | Apr. 13, 2014 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares issued |  |  | 3,552,357 |  |  |
Common stock, shares value representing payment for principal |  |  | $ 9,279,887 |  |  |
Common shares issued from warrant conversion |  | 2,010,500 |  |  |  |
Warrants outstanding | 0 |  | 0 |  |  |
Shares authorized for stock-based compensation |  |  |  | 3,000,000 | 2,500,000 | 2,500,000
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. |  |  |  |  |
Common Stock [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Eligible employee threshold percentage | 10.00% |  |  |  |  |
Purchase price of common stock percentage | 110.00% |  |  |  |  |
Common Stock [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares authorized for stock-based compensation |  |  |  |  |  | 500,000

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