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The Company and Basis of Presentation (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 28, 2015 | Jun. 28, 2015 | Dec. 28, 2014 | Jun. 29, 2014 | Dec. 29, 2013
Liquidity [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 26,415,000 | $ 26,415,000 | $ 30,050,000 | $ 34,330,000 | $ 37,406,000
Revolving credit facility | Silicon valley bank |  |  |  |  |
Liquidity [Line Items] |  |  |  |  |
Line of credit facility, additional borrowing capacity | 5,000,000 | 5,000,000 |  |  |
Maximum borrowing capacity | $ 6,000,000 | $ 6,000,000 |  |  |
Samsung |  |  |  |  |
Liquidity [Line Items] |  |  |  |  |
Percentage of revenue from major customer | 41.00% | 40.00% |  |  |
Maximum | Revolving credit facility | Silicon valley bank |  |  |  |  |
Liquidity [Line Items] |  |  |  |  |
Additional borrowing capacity | $ 10,000,000.0 | $ 10,000,000.0 |  |  |

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