Derivative Liabilities - Additional Information (Detail) (USD $)	6 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2013 Placement Agent	Dec. 31, 2012 Placement Agent	Jun. 30, 2013 Issuances date	Jun. 30, 2013 10% Convertible Redeemable Preferred Stock	Jun. 30, 2013 Conversion Options	Jun. 30, 2013 Conversion Options Issuances date	Jun. 30, 2013 Warrant	Jun. 30, 2013 Warrant Issuances date
Derivative [Line Items]
Derivative liability at fair value									$ 1,500,000		$ 540,000
Increase decrease in fair value of un hedged derivative instruments								3,300,000		1,800,000
Warrant exercise price			1				10
Warrants to purchase 10% Convertible Preferred Stock							10.00%
Class of Warrant or Right, Number of Securities Called by Warrants or Rights							58,352
Expected life	2 years 2 months 12 days						5 years
Fair value assumptions, expected dividend rate	0.00%					0.00%	0.00%
Volatility	50.00%					50.00%	129.00%
Risk-free interest rate	0.30%					0.40%	2.10%
Warrants Not Settleable in Cash, Fair Value Disclosure				122,357	81,716
Change in fair value of warrant liability				93,659
Convertible debt, noncurrent	$ 6,908,615	$ 5,671,162