Common Stock Warrant Liability - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended		12 Months Ended		48 Months Ended
	Jul. 31, 2011	Jun. 30, 2010	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013 After Reverse Split	Jul. 31, 2011 After Reverse Split	Apr. 30, 2011 After Reverse Split
Class Of Warrant Or Right [Line Items]
Proceeds from issuance of warrants			$ 60,000	$ 60,000	$ 200,000
Number of shares the warrants may acquire		1.5	1.5
Purchase price of warrants issued		$ 300,000	$ 300,000
Common stock warrants expiration date			2020-06
Common stock warrants exercise price		10.30				10.30	6.64	6.90
Warrant vested upon issuance			20.00%		20.00%
Common stock warrants annual vesting percentage on each anniversary date			20.00%		20.00%
Common stock warrants percentage vested			80.00%		80.00%
Common stock issued as purchase consideration	3.0
Price per share of common stock issued							$ 6.64
Percentage of common stock warrants waiving protection provisions	79.30%