Nature of the Business and Basis of Presentation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands			9 Months Ended
	Jul. 02, 2015	Jun. 26, 2015	Sep. 30, 2015
Nature Of Business And Basis Of Presentation [Line Items]
Entity incorporated year			Oct. 31, 2010
Entity incorporated state name			State of Delaware
Common Stock [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Common stock issued and sold			8,545,138
Net proceeds from issuance of common stock from IPO after deducting underwriting discounts and commissions	$ 139,267
Conversion of redeemable convertible preferred stock into common stock	22,866,987		22,866,987
Initial Public Offering ("IPO") [Member] | Common Stock [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Common stock issued and sold	8,545,138
Public offering price per share	$ 18.00	$ 18.00
Conversion of redeemable convertible preferred stock into common stock		22,866,987
Underwriters Option to Purchase Additional Shares [Member] | Common Stock [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Common stock issued and sold	1,114,583