Convertible Preferred Stock - Additional Information (Detail) - $ / shares		12 Months Ended
	Jun. 26, 2015	Dec. 31, 2015	Jul. 01, 2015	Dec. 31, 2014
Common Stock [Member]
Class of Stock [Line Items]
Conversion of redeemable convertible preferred stock into common stock	22,866,987	22,866,987
Convertible Preferred Stock Series A, A-2, B, C, D and D-1 [Member]
Class of Stock [Line Items]
Convertible preferred stock, shares authorized		10,000,000	10,000,000	24,348,003
Convertible preferred stock, par value		$ 0.001	$ 0.001	$ 0.001
Conversion of redeemable convertible preferred stock into common stock	22,866,987	(22,866,987)