Purchased Intangible Assets, Net - Information Regarding Other Acquisition Related Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018
Finite-Lived Intangible Assets [Line Items]
Finite Lived, Gross Carrying Amount	$ 8,387	$ 8,387
Accumulated Amortization	8,113	7,498
Finite Lived, Net Carrying Amount	274	889
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Finite Lived, Gross Carrying Amount	3,119	3,119
Accumulated Amortization	3,083	3,040
Finite Lived, Net Carrying Amount	36	79
Purchased technology
Finite-Lived Intangible Assets [Line Items]
Finite Lived, Gross Carrying Amount	5,148	5,148
Accumulated Amortization	4,910	4,338
Finite Lived, Net Carrying Amount	238	810
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Finite Lived, Gross Carrying Amount	40	40
Accumulated Amortization	40	40
Backlog
Finite-Lived Intangible Assets [Line Items]
Finite Lived, Gross Carrying Amount	80	80
Accumulated Amortization	$ 80	$ 80