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Stock-Based Compensation - Summary of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
$ / shares
shares
Dec. 30, 2018
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Options outstanding shares, beginning balance | shares 2,150  
Options, exercised | shares (22)  
Options, canceled | shares (198)  
Options outstanding shares, ending balance | shares 1,930 2,150
Options outstanding shares, exercisable | shares 1,534  
Options outstanding weighted average exercise price, beginning balance | $ / shares $ 11.49  
Options, weighted average exercise price, exercised | $ / shares 7.93  
Options, weighted average exercise price, canceled | $ / shares 13.54  
Options outstanding weighted average exercise price, ending balance | $ / shares 11.32 $ 11.49
Options outstanding weighted average exercise price, exercisable | $ / shares $ 11.05  
Options outstanding aggregate intrinsic value | $   $ 378
Option outstanding weighted average remaining term 5 years 14 days 5 years 1 month 17 days
Options exercisable weighted average remaining term 4 years 1 month 24 days