Cash, Cash Equivalents and Short-Term Investments and Long-Term Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Jan. 02, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 48,260	$ 46,667
Unrealized Holdings Gains	1
Unrealized Holdings Losses	23	40
Fair Value	48,238	46,627
Cash and Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	27,043	13,746
Fair Value	27,043	13,746
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,610	23,215
Unrealized Holdings Losses	8	7
Fair Value	17,602	23,208
Short-term Investments | Corporate bonds and medium-term notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,586	9,978
Unrealized Holdings Losses	6	7
Fair Value	8,580	9,971
Short-term Investments | Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	600	4,238
Fair Value	600	4,238
Short-term Investments | U.S. treasury and agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,432	8,999
Unrealized Holdings Losses	1
Fair Value	6,431	8,999
Other Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,607	9,706
Unrealized Holdings Gains	1
Unrealized Holdings Losses	15	33
Fair Value	3,593	9,673
Other Long-term Investments | Corporate bonds and medium-term notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,510	6,212
Unrealized Holdings Losses	11	23
Fair Value	2,499	6,189
Other Long-term Investments | Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	500
Unrealized Holdings Losses	4
Fair Value	496
Other Long-term Investments | U.S. treasury and agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	597	3,494
Unrealized Holdings Gains	1
Unrealized Holdings Losses		10
Fair Value	598	3,484
Cash
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18,726	6,208
Fair Value	18,726	6,208
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,317	7,538
Fair Value	8,317	$ 7,538
Commercial paper | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,992
Unrealized Holdings Losses	1
Fair Value	$ 1,991