Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		1 Months Ended	6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013	Nov. 30, 2013 Common Class B [Member]	Jun. 29, 2014 Common Class B [Member]	Jun. 29, 2014 Common Class A [Member]
Class of Stock [Line Items]
Outstanding shares of preferred stock automatically converted to shares of Class B Common Stock, upon Ccosing of Initial Public Offering					60,621,233
Common Stock, voting rights						10	1
Calculation of Basic and Diluted Income (Loss) Per Share)
Net loss	$ 7,756	$ 4,001	$ 4,806	$ 2,406
Less: Accretion of convertible redeemable preferred stock	0	(2,531)	0	(5,062)
Less: Undistributed earnings attributable to participating securities	0	(1,470)	0	0
Net loss attributable to Class A and Class B common stockholders	$ 7,756	$ 0	$ 4,806	$ (2,656)
Weighted average shares used to compute basic net loss per Class A and Class B common share (in shares)	124,423,877	49,891,357	124,177,090	48,156,694
Effect of potentially dilutive securities:
Stock options (in shares)	8,586,514	0	8,864,658	0
Unvested restricted common shares (in shares)	56,244	0	60,058	0
Weighted average shares used to compute diluted net loss per Class A and Class B common share (in shares)	133,066,635	49,891,357	133,101,806	48,156,694
Net loss per share attributable to Class A and Class B common stockholders—basic (in dollars per share)	$ 0.06	$ 0.00	$ 0.04	$ (0.06)
Net loss per share attributable to Class A and Class B common stockholders—diluted (in dollars per share)	$ 0.06	$ 0.00	$ 0.04	$ (0.06)