Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Balance - December 31, 2012	$ 283,221
Current period other comprehensive loss	(82,155)
Amounts reclassified from accumulated other comprehensive income	(16,997)
Balance - June 30, 2013	184,069
Unrealized Gain on Marketable Securities, Net of Tax [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Balance - December 31, 2012	97,220
Current period other comprehensive loss	(80,223)
Amounts reclassified from accumulated other comprehensive income	(16,997)
Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Balance - December 31, 2012	186,001
Current period other comprehensive loss	(1,932)
Balance - June 30, 2013	$ 184,069