Debt - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Jan. 31, 2013	Dec. 31, 2012	Jul. 31, 2012
Debt Instrument [Line Items]
Loan and security agreement, maximum credit						$ 3,000,000
Loan and security agreement, interest rate	4.50%
Loan and security agreement, payback period	24 months
Loan and security agreement, available credit		0		0				2,000,000
Loan and security agreement, interest incurred		34,125	8,500	102,125	8,500
Loan and security agreement, expiration date				Jun. 01, 2022
Loan and security agreement, amount drawn							2,000,000		1,000,000
Initial fair value of warrant issued							49,000		24,250
Unamortized debt discount		$ 51,762		$ 51,762				$ 20,208
Series A convertible preferred stock [Member]
Debt Instrument [Line Items]
Warrants exercisable, stock issued							8,000		4,000
Warrants exercisable, exercise price							7.50		7.50
Common stock [Member]
Debt Instrument [Line Items]
Warrants exercisable, stock issued		12,000		12,000
Warrants exercisable, exercise price		7.50		7.50