Weighted Average Shares Outstanding for Diluted Net Loss per Share (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted average shares outstanding used for basic net loss per share	43,406,251	40,154,812	43,155,601	37,367,368
Add: weighted average shares of convertible note payable	1,449,212	1,400,848
Weighted average shares outstanding used for diluted net loss per share	44,855,463	41,555,660	43,155,601	37,367,368