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Nature of Business, Basis of Presentation and Significant Accounting Policies - Textual (Details) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 30, 2017 USD ($) Customer shares | Dec. 31, 2016 USD ($) Customer shares | Dec. 26, 2015 USD ($) Customer shares
Accounting Policies [Line Items] |  |  |
Fiscal year duration | 364 days | 371 days | 364 days
Products revenues | $ 214,877 | $ 185,066 | $ 146,945
Cost of products revenues | 100,910 | 85,391 | 76,224
Service revenues | 43,744 | 36,063 | 40,422
Cost of service revenues | 20,804 | 20,160 | 19,450
Foreign currency transaction gain (loss) | $ (600) | (400) | 500
Maximum period of delivery to customers | 6 months |  |
Maximum period services are provided over the fixed arrangement term | 12 months |  |
Product warranty period | 12 months |  |
Advertising costs | $ 200 | $ 200 | $ 300
Potential dilutive common stock equivalents, using treasury stock method | shares | 585 | 498 | 316
Number of Major Customer | Customer | 5 | 5 | 5
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Concentration of risk percentage | 73.00% | 73.00% | 69.00%
Stock Options [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Potential dilutive common stock equivalents, using treasury stock method | shares | 600 | 500 | 300
Reclassification [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Products revenues | $ 12,100 | $ 11,000 |
Cost of products revenues | $ 2,700 | $ 2,400 |
Service revenues |  |  | $ 7,900
Cost of service revenues |  |  | $ 3,000
Minimum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Fiscal year duration | 364 days |  |
Maximum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Fiscal year duration | 371 days |  |

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