Subsequent Events - Additional Information (Detail) (USD $)	Sep. 30, 2014	Jul. 31, 2014	Dec. 31, 2013	Oct. 07, 2014 Subsequent Events [Member] Trellis Biosciences, LLC [Member]
Subsequent Event [Line Items]
Common stock, shares authorized	100,000,000	100,000,000	28,571,428	132,380
Common stock value in consideration of license	$ 2,008		$ 101	$ 500,000