Common Stock - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2015	Apr. 14, 2015	Dec. 31, 2014
Equity [Abstract]
Common stock, par value	$ 0.001	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000	45,000,000
Description of voting rights to shareholders	Each share of common stock entitles the holder to one vote on all matters submitted to a vote of the Company’s stockholders.
Common stock dividends declared	$ 0