Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Income Taxes [Line Items]
Accrued interest and penalties	$ 0
Ending balance of unrecognized tax benefits	937,000	$ 861,000	$ 1,027,000	$ 954,000
Unrecognized tax benefits recognition impact on income tax rate	$ 937,000
Earliest Tax Year
Income Taxes [Line Items]
Open Tax Year	2009
Latest Tax Year
Income Taxes [Line Items]
Open Tax Year	2015
Federal
Income Taxes [Line Items]
Net operating loss	$ 12,700,000
Stock option deduction	$ 2,600,000
Net operating loss expiration year	2032
Research & development credit	$ 1,400,000
Tax credit carryforward expiration year	2026
State
Income Taxes [Line Items]
Net operating loss	$ 14,500,000
Stock option deduction	$ 2,300,000
Net operating loss expiration year	2020
Research & development credit	$ 2,100,000