Property and Equipment, Net - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Inventory, Gross	$ 4,810,411		$ 4,810,411		$ 5,956,205
Accumulated depreciation	5,307,392		5,307,392		5,403,414
Depreciation expense	183,466	609,007	878,997	1,104,034
MelaFind Systems [Member]
Property, Plant and Equipment [Line Items]
Inventory, Gross	4,277,581		4,277,581		5,401,866
Accumulated depreciation	$ 725,598		$ 725,598