Equity - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended						0 Months Ended		0 Months Ended
	Aug. 31, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Warrant [Member]	Sep. 30, 2014 Minimum [Member]	Sep. 30, 2014 Maximum [Member]	Feb. 07, 2014 Gulfpointe Capital [Member]	Feb. 07, 2014 Gulfpointe Capital [Member]	Mar. 16, 2014 Chief Executive Officer [Member]	Mar. 12, 2014 Chief Executive Officer [Member]	Mar. 12, 2014 Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of Common stock	8,050,000
Share price	$ 4.60
Gross proceeds	$ 37,000,000
Net proceeds from public offering	34,500,000	34,430,000	9,012,000
Underwriting fees and offering costs	2,500,000
Stock option to purchase		3,934,878
Exercise prices range, lower limit		$ 0.31
Exercise prices range, upper limit		$ 5.99
Class of Warrant or Right, exercised									83,333			375,000
Class of Warrant or Right, Exercise Price of Warrants or Rights						$ 1.43	$ 1.50		$ 0.75			$ 1.05
Proceeds from Warrant Exercises								$ 62,500			$ 393,750
Number Of Warrants Expired										250,000
Warrants to purchase common stock, shares		59,969,375		49,118,373	650,000