Other Current Assets (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Other Assets, Current [Line Items]
Supplies inventory	$ 673,044	$ 604,179
Deferred offering costs	134,518	341,166
Prepaid expenses	315,014	132,201
Other current assets	$ 1,122,576	$ 1,077,546