Fixed Assets - Summary of Property and Equipment (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Gross	$ 9,094,198	$ 9,094,198
Accumulated depreciation and amortization	(6,098,945)	(5,403,414)
Net	2,995,253	3,690,784	[1]
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross	905,888	905,888
Estimated Useful Life	Lease Term
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	2,022,833	2,022,833
Estimated Useful Life	3-5 years
MelaFind Systems [Member]
Property, Plant and Equipment [Line Items]
Gross	$ 5,081,816	$ 5,081,816
Estimated Useful Life	3 years
Useful Life	3 years
Minimum [Member] | Laboratory and Research Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful Life	3 years
Minimum [Member] | Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful Life	3 years
Maximum [Member] | Laboratory and Research Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful Life	5 years
Maximum [Member] | Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful Life	5 years

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