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Related Party Notes Payable (Detail) (USD $)
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1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 4 Months Ended | 12 Months Ended | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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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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Sep. 30, 2011
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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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Sep. 30, 2012
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Sep. 30, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2013
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Feb. 02, 2012
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Apr. 30, 2011
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Nov. 30, 2010
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Dec. 31, 2006
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Feb. 29, 2012
If Converted Prior to Maturity Date or Consumption of Qualified IPO [Member]
Related Party BSC Convertible Notes Payable [Member]
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Feb. 29, 2012
If Converted In Context Other than Qualified Financing [Member]
Related Party BSC Convertible Notes Payable [Member]
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Oct. 31, 2009
BSC Notes [Member]
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Dec. 31, 2011
Summer 2011 Notes [Member]
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Dec. 31, 2011
Warrant [Member]
Minimum [Member]
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Dec. 31, 2011
Warrant [Member]
Maximum [Member]
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Dec. 31, 2011
Warrant [Member]
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Dec. 31, 2010
Warrant [Member]
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Dec. 31, 2009
Warrant [Member]
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Dec. 31, 2008
Warrant [Member]
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Feb. 02, 2012
Qualified Financing from Medtronic, Inc., St. Jude Medical, Inc., or Johnson & Johnson [Member]
Related Party BSC Convertible Notes Payable [Member]
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Feb. 02, 2012
Other Investors [Member]
Related Party BSC Convertible Notes Payable [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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Dec. 31, 2011
Maximum [Member]
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Feb. 29, 2012
Related Party BSC Convertible Notes Payable [Member]
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Dec. 31, 2009
Related Party BSC Convertible Notes Payable [Member]
|
Feb. 02, 2012
Related Party BSC Convertible Notes Payable [Member]
|
Dec. 31, 2011
Related Party BSC Convertible Notes Payable [Member]
|
Dec. 31, 2010
Related Party BSC Convertible Notes Payable [Member]
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Feb. 29, 2012
Related Party 2011 Unsecured Convertible Notes Payable [Member]
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Sep. 30, 2011
Related Party 2011 Unsecured Convertible Notes Payable [Member]
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Dec. 31, 2011
Related Party 2011 Unsecured Convertible Notes Payable [Member]
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Dec. 31, 2011
BSC Notes [Member]
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Dec. 31, 2011
The 2011 Unsecured Convertible Notes Payable [Member]
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Dec. 31, 2011
Summer 2011 Notes [Member]
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| Proceeds from Related Party Debt (in Dollars) | $ 3,500,000 | $ 3,500,000 | |||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Interest Rate, Stated Percentage | 10.00% | 10.00% | 4.50% | 8.00% | 10.00% | 10.00% | 0.00% | 10.00% | 0.00% | 15.00% | 15.00% | ||||||||||||||||||||||||||||||||
| Related Party Convertible Notes Payable, Extension Period | 3 years | ||||||||||||||||||||||||||||||||||||||||||
| (in Dollars) | 4,338,601 | 4,338,601 | 4,377,294 | 4,338,601 | 3,500,000 | 2,846,764 | 877,294 | ||||||||||||||||||||||||||||||||||||
| Maximum Percentage of Cash Proceeds from Qualified Financing Used to Prepay Outstanding Related Party Notes | 100.00% | 25.00% | |||||||||||||||||||||||||||||||||||||||||
| Threshold Amount of Qualified Initial Public Offering (in Dollars) | 20,000,000 | ||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Convertible, Conversion Ratio | 1 | 1 | |||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ 8.00 | $ 0.60 | $ 0.60 | $ 8.00 | $ 4.00 | $ 8.00 | $ 0.60 | ||||||||||||||||||||||||||||||||||||
| Derivative, Gain (Loss) on Derivative, Net (in Dollars) | (7,439) | (7,439) | 1,227,500 | ||||||||||||||||||||||||||||||||||||||||
| Proceeds from Unsecured Notes Payable (in Dollars) | 1,310,000 | ||||||||||||||||||||||||||||||||||||||||||
| Warrants Issued During Period (in Shares) | 2,727,274 | 7,607,071 | 2,122,500 | 25,444 | 1,310,000 | ||||||||||||||||||||||||||||||||||||||
| Term of Related Party Unsecured Convertible Notes Payable | 2 years | ||||||||||||||||||||||||||||||||||||||||||
| Term of Warrants | 5 years | 5 years | 5 years | 5 years | 2 years | ||||||||||||||||||||||||||||||||||||||
| Warrants Issued During Period, Weighted Average Exercise Price (in Dollars per share) | $ 1.45 | $ 1.05 | $ 0.29 | $ 8.00 | $ 0.01 | ||||||||||||||||||||||||||||||||||||||
| Conversion Price of Unsecured Convertible Notes Payable Upon Consummation of Initial Public Offering | 60.00% | ||||||||||||||||||||||||||||||||||||||||||
| Conversion Price of Unsecured Convertible Notes Payable Upon Consummation of Reverse Merger | 60.00% | ||||||||||||||||||||||||||||||||||||||||||
| Debt Conversion, Original Debt, Amount (in Dollars) | 10,811,500 | 1,131,399 | 1,425,865 | ||||||||||||||||||||||||||||||||||||||||
| Debt Conversion, Converted Instrument, Shares Issued (in Shares) | 195,868 | 2,376,447 | |||||||||||||||||||||||||||||||||||||||||
| Amount of Unamortized Discount Associated with Relative Fair Value of Warrants Written Off (in Dollars) | 405,602 | ||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Convertible, Effective Interest Rate | 10.00% | 10.00% | 10.00% | 10.00% | |||||||||||||||||||||||||||||||||||||||
| Percent Proceeds Required to Prepaying Outstanding Debt | 100.00% | 25.00% | |||||||||||||||||||||||||||||||||||||||||
| Proceeds from Issuance Initial Public Offering | 20,000,000 | ||||||||||||||||||||||||||||||||||||||||||
| Derivative Liabilities | 1,227,500 | (1,227,500) | 0 | ||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Unamortized Discount | 653,236 | 2,775,300 | 486,102 | 0 | 653,236 | 432,706 | 0 | ||||||||||||||||||||||||||||||||||||
| Convertible Debt | 1,310,000 | 4,071,000 | 3,805,500 | 2,000,000 | 1,310,000 | ||||||||||||||||||||||||||||||||||||||
| Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares) | 50,000 | 1,310,000 | 25,444 | 1,902,750 | 4,600,842 | 141,500 | |||||||||||||||||||||||||||||||||||||
| Term of Vested Warrants | 5 years | ||||||||||||||||||||||||||||||||||||||||||
| Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item) | 1.10 | 0.75 | 0.01 | 0.94 | 0.94 | 0.43 | 4.00 | 0.43 | 3.74 | 0.42 | 1.74 | ||||||||||||||||||||||||||||||||
| Conversion Price As Percentage of Public Offering Price | 60.00% | 80.00% | |||||||||||||||||||||||||||||||||||||||||
| Conversion Price Equal to Fair Market Value of Stock | 60.00% | ||||||||||||||||||||||||||||||||||||||||||
| Proceeds from Issuance or Sale of Equity | 5,000,000 | 1,310,000 | |||||||||||||||||||||||||||||||||||||||||
| Conversion Price As Percentage Of Price Paid By Investors In Equity Financing | 60.00% | ||||||||||||||||||||||||||||||||||||||||||
| Warrants and Rights Outstanding | $ 486,102 | ||||||||||||||||||||||||||||||||||||||||||
| Fair Value Assumptions, Exercise Price (in Dollars per share) | $ 9.64 | $ 0.60 | $ 0.01 | ||||||||||||||||||||||||||||||||||||||||
| Fair Value Assumptions, Expected Dividend Rate | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | ||||||||||||||||||||||||||||||||||||||
| Fair Value Assumptions, Expected Volatility Rate | 38.28% | 46.58% | 44.84% | 48.67% | 49.36% | 44.81% | 43.00% | ||||||||||||||||||||||||||||||||||||
| Fair Value Assumptions, Risk Free Interest Rate | 1.14% | 0.25% | 0.61% | 0.81% | 1.13% | 2.36% | 0.45% | 0.21% | |||||||||||||||||||||||||||||||||||
| Fair Value Assumptions, Expected Term | 2 years | 54 days | 9 months | 5 years | 5 years | 2 years | |||||||||||||||||||||||||||||||||||||