Property and Equipment, Net - Summary of Property and Equipment (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Gross	$ 9,179,966	$ 9,094,198
Accumulated depreciation and amortization	(5,307,392)	(5,403,414)
Net	3,872,574	3,690,784	[1]
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross	905,888	905,888
Estimated Useful Life	Lease Term
Laboratory and Research Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross	1,083,661	1,083,661
Estimated Useful Life	3-5 years
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross	2,005,344	2,022,833
Estimated Useful Life	3-5 years
MelaFind Systems [Member]
Property, Plant and Equipment [Line Items]
Gross	$ 5,185,073	$ 5,081,816

[1] Derived from the audited balance sheet as of December 31, 2013