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Intangible Assets (Schedule of net intangible assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Original cost | $ 6,803 | $ 5,781 |
Accumulated amortization | 5,837 | 4,734 |
Intangible assets, Net | 966 | 1,047 |
Amortization expense | 1,103 | 1,888 | $ 2,240
Current technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Original cost | 3,832 | 3,844 |
Accumulated amortization | 3,832 | 3,181 |
Intangible assets, Net |  | 663 |
Useful life | 3 years |  |
Customer relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Original cost | $ 1,937 | 1,937 |
Accumulated amortization | 1,937 | 1,553 |
Intangible assets, Net |  | 384 |
Useful life | 3 years |  |
Capitalization of software development costs [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Original cost | $ 928 |  |
Accumulated amortization | 37 |  |
Intangible assets, Net | 891 |  |
Licenses [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Original cost | 106 |  |
Accumulated amortization | 31 |  |
Intangible assets, Net | $ 75 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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