Balances of Derivative Liability (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014		Dec. 31, 2013
Debt Instrument [Line Items]
Balance	$ 1,104,423		$ 2,335,560
Liability on issuance of debt and warrants	0		1,691,267
Change in fair value at year end	2,082,640	[1]	(2,922,404)
Balance	3,187,063		1,104,423
Warrant
Debt Instrument [Line Items]
Balance	803,484		1,730,044
Liability on issuance of debt and warrants	0		762,111
Change in fair value at year end	1,320,834	[1]	(1,688,671)
Balance	2,124,318		803,484
Conversion Feature
Debt Instrument [Line Items]
Balance	300,939		605,516
Liability on issuance of debt and warrants	0		929,156
Change in fair value at year end	761,806		(1,233,733)
Balance	$ 1,062,745		$ 300,939

[1] Included in the Statement of Operations on the line “Change in fair value of derivative liabilities.”