Organization and Description of Business - Additional Information (Detail)	0 Months Ended	9 Months Ended
	Aug. 25, 2014 Patient	Sep. 30, 2014	Aug. 25, 2014 Patient
Collaboration Arrangement Disclosure [Abstract]
Date of incorporation		Dec. 19, 2001
Number of patients enrolled			3,250
Number of subjects in Phase 3 trial	13,200