Liabilities - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Nov. 30, 2012	Oct. 31, 2012	Mar. 31, 2012
Debt Instrument [Line Items]
Convertible debt	$ 1,129,473	$ 0
Unamortized discount	520,851	0
Debentures payment term	6 months
Original issue discount, percent	5.00%
Conversion price at maturity	$ 0.099		$ 0.099	$ 0.099	$ 0.0573
Proceeds from issuance of debentures	2,731,000
Debt issuance costs	574,762	0
Original issue discount	167,685
Non-cash expense related to warrants	778,000
Exercisable warrants to purchase shares of common stock	33,163,965
Fair value estimate of warrants	5 years
Warrant liability	1,730,044
Change in fair value of warrant liability	777,824
Derivative warrants expiration period	5 years
Non-cash expense related to convertible debentures	1,562,000
Debt conversion period	6 months
Change in fair value of derivative liability	980,129
Debt Instrument, Face Amount	1,003,158				2,350,527
Derivative Liability, Fair Value, Gross Liability	605,516
Interest Expense, Subordinated Notes and Debentures	290,000
Intrest Expense ,Recognized Through Amortization Of The Derivative Liability Discount	1,315,773
Interest expense recognized, through amortization of warrant liability discount	1,239,426
Proceeds From Convertible Debt	3,305,762	0
Liability reclassified to Equity	2,554,000
Initial fair value of warrants noncash expense	490,204
Derivative Financial Instruments, Liabilities
Debt Instrument [Line Items]
Unamortized discount	270,537
Warrant Liability
Debt Instrument [Line Items]
Unamortized discount	222,330
Original Discount
Debt Instrument [Line Items]
Unamortized discount	27,984
Holders Warrants
Debt Instrument [Line Items]
Securities convertible or exercisable into shares	25,577,158
Agents Warrants
Debt Instrument [Line Items]
Securities convertible or exercisable into shares	7,586,807
Convertible Debentures
Debt Instrument [Line Items]
Securities convertible or exercisable into shares	12,337,378
Issuance of Debentures
Debt Instrument [Line Items]
Warrant liability	2,507,868
Non-cash expense related to convertible debentures	581,696
Derivative liability	2,167,341
Debentures One
Debt Instrument [Line Items]
Accrued interest rate per year	20.00%
Conversion price at maturity	$ 0.0573
Excess over face value of debentures	507,000
Debt Instrument, Convertible, If-converted Value in Excess of Principal	2,224,211
Interest Payable	222,421
Debt Instrument, Convertible, Number of Equity Instruments	42,698,711
Debt Instrument, Face Amount	126,316
Debentures Two
Debt Instrument [Line Items]
Debt Instrument, Convertible, Number of Equity Instruments	38,817,000
Debt Instrument, Face Amount	$ 2,224,211
Minimum
Debt Instrument [Line Items]
Accrued interest rate per year	16.00%
Conversion price at maturity	$ 0.0573
Convertible Debentures exercise price	$ 0.0745
Maximum
Debt Instrument [Line Items]
Accrued interest rate per year	20.00%
Conversion price at maturity	$ 0.099
Convertible Debentures exercise price	$ 0.1287