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Summary of Information About Stock Options Outstanding and Exercisable (Detail) - $0.83 - $5.35
12 Months Ended
Dec. 29, 2018
$ / shares
shares
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding By Exercise Price [Line Items]  
Options Outstanding, Number Outstanding | shares 1,937,934
Options Outstanding, Weighted Average Remaining Contractual Life (in years) 6 years 14 days
Options Outstanding, Weighted Average Exercise Price | $ / shares $ 4.57
Options Exercisable, Number Exercisable | shares 1,027,602
Options Exercisable, Weighted Average Remaining Contractual Life (in years) 4 years 1 month 20 days
Options Exercisable, Weighted Average Exercise Price | $ / shares $ 4.67