Related Party Transactions - Additional Information (Detail) (USD $)	9 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Feb. 06, 2014 Series D preferred stock [Member]	Sep. 30, 2014 Series D preferred stock [Member]	Feb. 10, 2014 Series D preferred stock [Member]	Feb. 06, 2014 Series D preferred stock [Member]	Dec. 31, 2013 Series D preferred stock [Member]
Related Party Transaction [Line Items]
Preferred stock, shares issued				0	1,124,260		1,124,000
Preferred stock, shares outstanding				0	1,124,260		1,124,000
Shares of common stock issued upon conversion of Series D preferred stock			6,266,175
Number of shares of Series D Preferred Stock outstanding after conversion						0
Common stock issued in lieu of board fees	17,753	31,117
Common stock issued	$ 62,000	$ 18,000