Credit Facility - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 2,500,000
Credit Facility expiration date	Jan. 15, 2016
Credit Facility limit restricted to support letter of credit	451,731
Line of credit facility, remaining borrowing capacity	$ 2,000,000
Prime Rate
Line of Credit Facility [Line Items]
Interest rate over prime rate	0.50%