Subsequent Events - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended						0 Months Ended						0 Months Ended
	Jun. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Oct. 31, 2012	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2012 Maximum [Member]	Feb. 20, 2014 Subsequent Event [Member] Plaintiff	Jan. 16, 2014 Subsequent Event [Member]	Jan. 31, 2014 Subsequent Event [Member] Maximum [Member]	Jan. 16, 2014 Subsequent Event [Member] Maximum [Member]	Jan. 31, 2014 Subsequent Event [Member] Minimum [Member]	Jan. 16, 2014 Subsequent Event [Member] Minimum [Member]	Jan. 16, 2014 Subsequent Event [Member] Series A [Member]	Jan. 16, 2014 Subsequent Event [Member] Series B [Member]	Jan. 16, 2014 Subsequent Event [Member] Series-A Placement Agent Warrants [Member]	Jan. 16, 2014 Subsequent Event [Member] Series-A Placement Agent Warrants [Member] Series A [Member]	Jan. 16, 2014 Subsequent Event [Member] Series-B Placement Agent Warrants [Member]	Jan. 16, 2014 Subsequent Event [Member] Series-B Placement Agent Warrants [Member] Series B [Member]	Jan. 16, 2014 Subsequent Event [Member] Common Stock [Member]
Subsequent Event [Line Items]
Public offering shares																				5,737,706
Common stock price	$ 4.45			$ 0.72	$ 2.48	$ 1.17	$ 1.33													$ 1.22
Proceeds from common stock	$ 23,500,000	$ 15,675,727	$ 21,946,801						$ 6,400,000
Additional warrants issued														2,868,853	2,868,853	86,066		86,066
Warrants exercise price										1.60	1.60	1.22	1.22	1.22	1.22	1.22		1.22
Warrant expiration period																	5 years		18 months
Class of warrants or right									4,421,195
Number of plaintiffs								2
Litigation settlement amount								$ 2,000,000