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Convertible Notes Payable (Detail) (USD $)
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0 Months Ended | 1 Months Ended | 2 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 2 Months Ended | 9 Months Ended | 1 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 5 Months Ended | 1 Months Ended | 5 Months Ended | 1 Months Ended | 1 Months Ended | 2 Months Ended | 5 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | |||||||||||||||||||||||||||||||||
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Feb. 02, 2012
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Jul. 31, 2012
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Feb. 29, 2012
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Oct. 31, 2011
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Apr. 30, 2011
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Jan. 31, 2011
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Nov. 30, 2010
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Mar. 31, 2010
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Dec. 31, 2009
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Oct. 31, 2009
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Dec. 31, 2010
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2006
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Dec. 31, 2013
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Feb. 24, 2012
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Sep. 30, 2012
Warrant [Member]
Minimum [Member]
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Sep. 30, 2012
Warrant [Member]
Maximum [Member]
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Feb. 27, 2012
Warrant [Member]
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Sep. 30, 2012
Warrant [Member]
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Nov. 30, 2010
Officer [Member]
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Nov. 30, 2010
Non-Employee Directors [Member]
The 2010 Junior Secured Notes Payable [Member]
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Nov. 30, 2010
Non-Employee Directors [Member]
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Apr. 30, 2011
Minimum [Member]
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Feb. 02, 2012
Minimum [Member]
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Dec. 31, 2011
Minimum [Member]
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Mar. 31, 2010
Minimum [Member]
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Apr. 30, 2011
Maximum [Member]
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Dec. 31, 2011
Maximum [Member]
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Feb. 29, 2012
Unamortized Discount [Member]
The 2010 Unsecured Convertible Notes Payable [Member]
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Feb. 27, 2012
Unamortized Discount [Member]
The 2011 Unit Offering Note [Member]
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Feb. 29, 2012
Umamortized Deferred Offering Costs [Member]
The 2010 Unsecured Convertible Notes Payable [Member]
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Feb. 27, 2012
Umamortized Deferred Offering Costs [Member]
The 2011 Unit Offering Note [Member]
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Feb. 29, 2012
The 2010 Unsecured Convertible Notes Payable [Member]
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Mar. 31, 2010
The 2010 Unsecured Convertible Notes Payable [Member]
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Dec. 31, 2011
The 2010 Unsecured Convertible Notes Payable [Member]
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Dec. 31, 2010
The 2010 Unsecured Convertible Notes Payable [Member]
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Oct. 31, 2011
2011 Unit Offering Notes [Member]
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Oct. 31, 2011
The 2011 Unit Offering Note [Member]
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Feb. 27, 2012
The 2011 Unit Offering Note [Member]
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Feb. 27, 2012
The 2011 Unit Offering Note [Member]
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Dec. 31, 2011
The 2011 Unit Offering Note [Member]
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Oct. 31, 2011
The 2011 Junior Secured Convertible Note [Member]
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Sep. 30, 2011
The 2011 Junior Secured Convertible Note [Member]
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Apr. 30, 2011
The 2011 Junior Secured Convertible Note [Member]
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Dec. 31, 2011
The 2011 Junior Secured Convertible Note [Member]
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Jul. 27, 2012
The 2011 Junior Secured Convertible Note [Member]
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Feb. 27, 2012
The 2011 Junior Secured Convertible Note [Member]
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Mar. 31, 2010
March 2010 Notes [Member]
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Nov. 30, 2010
The 2010 Junior Secured Notes Payable [Member]
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Dec. 31, 2010
The 2010 Junior Secured Notes Payable [Member]
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Dec. 31, 2011
The 2011 Junior Secured Convertible Note Payable, Net [Member]
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| Debt Instrument, Interest Rate, Stated Percentage | 10.00% | 10.00% | 10.00% | 10.00% | 4.50% | 8.00% | 4.50% | 0.00% | 10.00% | 10.00% | 10.00% | ||||||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Face Amount (in Dollars) | $ 4,071,000 | $ 100,000 | $ 2,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ 0.60 | $ 8.00 | $ 0.60 | $ 8.00 | $ 4.00 | $ 8.00 | $ 1.00 | $ 0.60 | $ 0.60 | $ 0.60 | $ 0.54 | $ 1.00 | $ 0.60 | ||||||||||||||||||||||||||||||||||||||||||||
| Conversion Price As Percentage of Public Offering Price | 80.00% | 60.00% | 60.00% | 80.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Minimum Conversion Price Per Share (in Dollars per share) | $ 0.60 | $ 4.00 | $ 0.60 | $ 0.60 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Debt Conversion, Original Debt, Amount (in Dollars) | 10,811,500 | 1,131,399 | 4,868,017 | 5,491,929 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Debt Conversion, Converted Instrument, Shares Issued (in Shares) | 195,868 | 4,868,041 | 9,153,248 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Interest Expense (in Dollars) | 85,828 | 705,839 | 2,507,582 | 1,846,164 | 2,498,204 | 1,590,471 | 152,473 | 13,500 | 1,063,018 | 13,883 | 785,239 | ||||||||||||||||||||||||||||||||||||||||||||||
| Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares) | 50,000 | 25,444 | 1,310,000 | 1,310,000 | 1,902,750 | 141,500 | 4,600,842 | 50,000 | 812,500 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Maturity | 3 years | 3 years | 3 years | 3 years | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Term of Warrants | 5 years | 5 years | 5 years | 5 years | 5 years | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Warrants Issued During Period, Weighted Average Exercise Price (in Dollars per share) | $ 1.45 | $ 1.05 | $ 0.75 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Number of Unit Offering Notes Sold | 38.055 | 54.305 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Aggregate Principal Amount of Unit Offering Notes Sold (in Dollars) | 5,430,500 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Warrants Issued During Period (in Shares) | 2,727,274 | 7,607,071 | 941,288 | 2,715,250 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Placement Agent Cash Fee as Percentage of Gross Proceeds | 10.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Percentage of Aggregate Number of Shares of Common Stock Issuable Upon Conversion of Unit Offering Notes | 8.00% | 8.00% | 8.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item) | 1.10 | 0.75 | 0.94 | 0.01 | 0.94 | 0.01 | 0.43 | 4.00 | 0.60 | 0.60 | 0.60 | ||||||||||||||||||||||||||||||||||||||||||||||
| Warrants Not Settleable in Cash, Fair Value Disclosure (in Dollars) | 237,299 | 237,299 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair Value Assumptions, Expected Dividend Rate | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair Value Assumptions, Expected Volatility Rate | 38.28% | 46.58% | 44.84% | 41.30% | 49.00% | 49.00% | 48.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair Value Assumptions, Risk Free Interest Rate | 1.14% | 0.25% | 0.61% | 0.19% | 0.93% | 0.93% | 0.45% | 0.89% | |||||||||||||||||||||||||||||||||||||||||||||||||
| Fair Value Assumptions, Expected Term | 2 years | 54 days | 9 months | 1 year 255 days | 5 years | 5 years | 5 years | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Deferred Offering Costs (in Dollars) | 313,007 | 66,500 | 313,007 | 237,299 | 237,299 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intrinsic Value of Beneficial Conversion Feature (in Dollars) | 834,555 | 163,633 | 383,204 | 383,204 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Estimated Fair Value of Common Stock (in Dollars per share) | $ 28,696 | $ 0.60 | $ 0.60 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Approximate Market Interest Rate | 10.00% | 10.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Effective Conversion Price of Conversion Feature Under Unit Offering Notes (in Dollars per share) | $ 0.54 | $ 0.54 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Minimum Net Proceeds of a Qualified Financing (in Dollars) | 10,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Percentage of Outstanding Shares of Stock on Fully Diluted Basis | 10.00% | 10.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Period to Complete a Qualified Financing | 180 days | 360 days | 360 days | 180 days | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Convertible Notes Payable, Noncurrent (in Dollars) | 4,338,601 | 2,000,000 | 2,000,000 | 3,308,390 | 3,499,725 | 2,000,000 | 1,308,390 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Convertible, Effective Interest Rate | 10.00% | 10.00% | 10.00% | 10.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Convertible Debt | 2,000,000 | 4,071,000 | 1,310,000 | 1,310,000 | 3,805,500 | 100,000 | 1,625,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair Value Assumptions, Exercise Price (in Dollars per share) | $ 9.64 | $ 0.60 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Debt Issuance Cost (in Dollars) | 413,000 | 170,000 | 629,213 | 293,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Warrants Issued During Period, Value (in Dollars) | 120,218 | 812,500 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Unamortized Debt Issuance Expense | 44,579 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Proceeds from Issuance of Convertible Preferred Stock (in Dollars) | 10,000,000 | 7,965,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Selling Price of Unit | 0 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Other Liabilities | 2,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Units Issued (in Shares) | 10,714,286 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Proceeds From Units Issued | 100,000 | 247,164 | 90,000 | 1,625,000 | 190,000 | 158,816 | 3,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate | 3.50% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Common Stock, Value, Issued | 2,775,300 | 161,858 | 481,687 | 481,687 | 164,108 | 161,858 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Long-term Debt | 3,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Unamortized Discount | 2,775,300 | 653,236 | 653,236 | 571,275 | 316,610 | 327,266 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Convertible, Remaining Discount Amortization Period | 10 years | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Units Issued Purchased (in Shares) | 567,203 | 38 | 54.3 | 882,726 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Other Accrued Liabilities, Current | $ 2,079,574 | $ 1,305,622 | $ 1,305,622 | $ 2,015,046 | $ 2,079,574 | $ 66,500 | $ 100,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Class of Warrant or Right, Outstanding (in Shares) | 8,945,247 | 8,945,247 | 1,922,944 | 16.25 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Perfect of Gross Proceeds Unit Cash Fee | 10.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Finite-Lived Intangible Asset, Useful Life | 5 years | 3 years | |||||||||||||||||||||||||||||||||||||||||||||||||||||||