Related Party Transactions - Additional Information (Detail) (USD $)	6 Months Ended			0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Feb. 06, 2014	Feb. 06, 2014 Series D preferred stock [Member]	Jun. 30, 2014 Series D preferred stock [Member]	Feb. 10, 2014 Series D preferred stock [Member]	Dec. 31, 2013 Series D preferred stock [Member]
Schedule of Other Related Party Transactions [Line Items]
Preferred stock, shares issued					0	1,124,260	1,124,000
Preferred stock, shares outstanding					0	0	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	8,546	18,617
Common stock issued	$ 36,000	$ 9,000