Change in Fair Value of Warrant and Targets (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013
Derivative [Line Items]
Balance at December 31, 2012	$ 427,161
Initial Measure May 2013	2,917,539
Mark to Market	(88,056)
Balance at June 30, 2013	3,256,644
MDFA | Warrants 1
Derivative [Line Items]
Balance at December 31, 2012	111,811
Initial Measure May 2013	0
Mark to Market	(98,462)
Balance at June 30, 2013	13,349
MDFA | Warrants 2
Derivative [Line Items]
Balance at December 31, 2012	0
Initial Measure May 2013	15,330
Mark to Market	750
Balance at June 30, 2013	16,080
Hercules | Warrants
Derivative [Line Items]
Balance at December 31, 2012	0
Initial Measure May 2013	845,922
Mark to Market	5,698
Balance at June 30, 2013	851,620
Convertible Debt Warrant Liability | Warrants
Derivative [Line Items]
Balance at December 31, 2012	0
Initial Measure May 2013	1,027,770
Mark to Market	36,646
Balance at June 30, 2013	1,064,416
Conversion Feature
Derivative [Line Items]
Balance at December 31, 2012	0
Initial Measure May 2013	1,028,517
Mark to Market	36,311
Balance at June 30, 2013	1,064,828
Targets
Derivative [Line Items]
Balance at December 31, 2012	315,350
Initial Measure May 2013	0
Mark to Market	(68,999)
Balance at June 30, 2013	$ 246,351