Warrants - Additional Information (Detail) - $ / shares			9 Months Ended
	Aug. 14, 2015	Sep. 26, 2014	Sep. 30, 2015
Class of Warrant or Right [Line Items]
Warrant, expiration period		7 years
Amended and Restated Loan Agreement [Member]
Class of Warrant or Right [Line Items]
Common stock warrants issued	112,903
Warrants exercised			0
Warrant, expiration period			7 years
Warrants, exercise price	$ 3.10