Income Taxes - Rollforward of Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 744,705	$ 731,346
Additions based on tax positions related to the current year	62,800	0
Additions for tax positions of prior years	580,099	13,359
Reductions for tax positions of prior years	(69,627)	0
Ending balance	$ 1,317,977	$ 744,705