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Stockholders' Equity/(Deficit) - Additional Information (Detail) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  | 3 Months Ended |  | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2013 Incentive_Plan | Dec. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2012 Warrants [Member] Investor | Dec. 31, 2013 Unvested Restricted Stock Awards Excluded from EPS [Member] | Dec. 31, 2012 Unvested Restricted Stock Awards Excluded from EPS [Member] | Dec. 31, 2011 Unvested Restricted Stock Awards Excluded from EPS [Member] | Dec. 31, 2013 Common Stock [Member] | Mar. 31, 2013 Common Stock [Member] | Sep. 30, 2012 Common Stock [Member] | Dec. 31, 2013 Common Stock [Member] | Dec. 31, 2012 Common Stock [Member] | Jun. 03, 2010 Common Stock [Member] | Jan. 16, 2008 Common Stock [Member] | Aug. 17, 2007 Common Stock [Member] | Dec. 31, 2013 Common Stock [Member] Minimum [Member] | Dec. 31, 2013 Common Stock [Member] Warrants [Member] | Sep. 30, 2012 Common Stock [Member] Warrants [Member] | Sep. 30, 2012 Common Stock [Member] Employee Stock Incentive Plan [Member] | Aug. 17, 2007 Common Stock [Member] Restricted Stock Units (RSUs) [Member] | Sep. 30, 2012 Series G Convertible Preferred Stock [Member] | Dec. 31, 2013 Series G Convertible Preferred Stock [Member] Warrants [Member] Investor | Dec. 31, 2013 Series D Convertible, Preferred Stock [Member] | Dec. 31, 2012 Series D Convertible, Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | 83,882,577 | 75,416,203 |  |  |  |  |  | 3,552,357 |  | 140,000 | 3,552,357 | 1,441,013 |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares value representing payment for principal | $ 8,388 | $ 7,542 |  |  |  |  |  | $ 9,279,887 |  |  | $ 9,279,887 | $ 4,262,528 |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued from warrant conversion |  |  |  |  |  |  |  | 1,725,000 | 2,010,500 | 287,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of accredited investors to whom common stock stock issued |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |
Number of warrants exercised in exchange for common stock shares | 2,087,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,725,000 | 287,500 |  |  |  |  |  |
Common stock shares issued employee stock incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,900 |  |  |  |  |
Number of series G preferred stock converted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Preferred stock, shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,400 | 206,400
Preferred stock, shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,400 | 206,400
Convertible into common stock at a ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00 |
Liquidation preference |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.50 |
Convertible preferred stock conversion description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Series D is convertible into common stock at a ratio of 1 to 1 |
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 | 2,582,009 | 1,657,800 | 1,796,628 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average estimated fair value of stock options | $ 1.42 | $ 1.45 | $ 2.74 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic values of options exercisable | 16,450 | 371,142 | 133,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic values of options outstanding | 16,450 | 524,500 | 169,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic values of options exercised | 183,000 | 14,475 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of shares vested | 1,498,040 | 832,177 | 1,145,112 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation to unvested share-based compensation awards | 1,203,599 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average period | 1 year 9 months 29 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of restricted stock awards vested |  |  |  |  | 854,861 | 1,286,257 | 1,329,573 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of unvested restricted stock awards |  |  |  |  | 380,013 | 514,964 | 300,139 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value of restricted stock awards |  |  |  |  | $ 2.89 | $ 3.91 | $ 2.67 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average remaining contractual term |  |  |  |  | 1 year 2 months 12 days | 1 year | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost related to unvested restricted stock awards |  |  |  |  | $ 525,401 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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