Balances of Derivative Liability (Detail) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Balance	$ 2,335,560		$ 0
Liabililty on issuance of debt and warrants	1,691,261		4,678,260
Change in fair value at year end	(634,218)	[1]	211,037
Elimination of liability on conversion	(36,594)		(2,553,737)
Balance	3,356,009		2,335,560
Warrant
Debt Instrument [Line Items]
Balance	1,730,044		0
Liabililty on issuance of debt and warrants	762,105		2,510,919
Change in fair value at year end	(237,313)	[1]	(780,875)
Elimination of liability on conversion	0		0
Balance	2,254,836		1,730,044
Conversion Feature
Debt Instrument [Line Items]
Balance	605,516		0
Liabililty on issuance of debt and warrants	929,156		2,167,341
Change in fair value at year end	(396,905)		991,912
Elimination of liability on conversion	(36,594)		(2,553,737)
Balance	$ 1,101,173		$ 605,516

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