Income Taxes - Tax Effect of Temporary Differences and Carryforwards that Give Rise to Significant Portions of the Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Jan. 02, 2016	Jan. 03, 2015
Tax effect of temporary differences and carryforwards that give rise to significant portions of the net deferred tax assets
Net operating losses	$ 4,135	$ 4,278
Research and development credits	1,820	1,575
Accruals and reserves	1,823	1,681
Deferred revenue	120	113
Property and equipment	399	439
Intangible assets	792	825
Stock compensation	613	676
Other tax credits	89	94
Net deferred tax asset	9,791	9,681
Valuation allowance	(806)	(905)
Net deferred tax assets	$ 8,985	$ 8,776