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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. 31, 2016 USD ($) Customer shares | Dec. 26, 2015 USD ($) Customer shares | Dec. 27, 2014 USD ($) Customer shares
Accounting Policies [Line Items] |  |  |
Fiscal year duration | 371 days | 364 days | 364 days
Products revenues | $ 185,066 | $ 146,945 | $ 133,589
Cost of products revenues | 85,391 | 76,224 | 68,812
Service revenues | 36,063 | 40,422 | 32,854
Cost of service revenues | 20,160 | 19,450 | 19,086
Foreign currency transaction gain (loss) | $ (400) | 500 | 100
Maximum period of delivery to customers | 6 months |  |
Maximum period services are provided over the fixed arrangement term | 12 months |  |
Maximum measurement period | 1 year |  |
Product warranty period | 12 months |  |
Advertising costs | $ 200 | $ 300 | $ 200
Potential dilutive common stock equivalents, using treasury stock method | shares | 498 | 316 | 0
Anti-dilutive common stock equivalents excluded from calculation | shares |  |  | 400
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% | 69.00% | 72.00%
Stock Options [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Potential dilutive common stock equivalents, using treasury stock method | shares | 500 | 300 |
Reclassification [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Products revenues | $ 11,000 |  |
Cost of products revenues | $ 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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