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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Apr. 01, 2017 | Dec. 31, 2016
--- | --- | ---
Summary of Finite-lived intangible assets |  |
Adjusted cost | $ 29,633 | $ 29,307
Accumulated amortization | (29,272) | (28,895)
Finite lived intangible assets, Net carrying amount | 361 | 412
Developed technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 16,026 | 15,726
Accumulated amortization | (15,715) | (15,380)
Finite lived intangible assets, Net carrying amount | 311 | 346
Customer relationships [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 9,348 | 9,322
Accumulated amortization | (9,348) | (9,322)
Finite lived intangible assets, Net carrying amount | 0 | 0
Brand names [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 1,927 | 1,927
Accumulated amortization | (1,927) | (1,927)
Finite lived intangible assets, Net carrying amount | 0 |
Patented technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 2,252 | 2,252
Accumulated amortization | (2,202) | (2,186)
Finite lived intangible assets, Net carrying amount | 50 | 66
Trademark [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 80 | 80
Accumulated amortization | (80) | (80)
Finite lived intangible assets, Net carrying amount | $ 0 | $ 0

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