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Acquisitions (Major classes of intangible assets acquired and amortization expenses) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets Acquired | $ 2,386 | $ 5,147
Amortization expense recorded during the year ended December 31, 2015 | 1,817 | $ 318
Harmonics Holdings Incorporated [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets Acquired | 995 |
Amortization expense recorded during the year ended December 31, 2015 | 99 |
Harmonics Holdings Incorporated [Member] | Trademarks [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets Acquired | 26 |
Harmonics Holdings Incorporated [Member] | Technology Related Industry Accreditations [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets Acquired | $ 83 |
Harmonics Holdings Incorporated [Member] | Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Years | 10 years |
Finite-Lived Intangible Assets Acquired | $ 319 |
Harmonics Holdings Incorporated [Member] | Noncompete Agreements [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Years | 5 years |
Finite-Lived Intangible Assets Acquired | $ 75 |
Harmonics Holdings Incorporated [Member] | Developed Technology Rights [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Years | 10 years |
Finite-Lived Intangible Assets Acquired | $ 492 |
Pacific Power Systems Integration Incorporated [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets Acquired | 1,500 |
Amortization expense recorded during the year ended December 31, 2015 | 30 |
Pacific Power Systems Integration Incorporated [Member] | Technology Related Industry Accreditations [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets Acquired | $ 1,000 |
Pacific Power Systems Integration Incorporated [Member] | Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Years | 7 years |
Finite-Lived Intangible Assets Acquired | $ 400 |
Pacific Power Systems Integration Incorporated [Member] | Noncompete Agreements [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Years | 7 years |
Finite-Lived Intangible Assets Acquired | $ 100 |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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