Goodwill and Other Intangible Assets (Schedule of net other intangible assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Other intangible assets [Line Items]
Original cost	$ 2,196	$ 200
Accumulated amortization	125	20
Other intangible assets, Net	2,071us-gaap_FiniteLivedIntangibleAssetsNet	180us-gaap_FiniteLivedIntangibleAssetsNet
Useful life	3 years
Amortization expense	105us-gaap_AmortizationOfIntangibleAssets	20us-gaap_AmortizationOfIntangibleAssets
Intellectual property [Member]
Other intangible assets [Line Items]
Original cost	200	200
Accumulated amortization	87	20
Other intangible assets, Net	113	180
Useful life	3 years
Current technology [Member]
Other intangible assets [Line Items]
Original cost	1,456
Accumulated amortization	28
Other intangible assets, Net	1,428
Useful life	3 years
Customer relationships [Member]
Other intangible assets [Line Items]
Original cost	540
Accumulated amortization	10
Other intangible assets, Net	$ 530
Useful life	3 years

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.

Reference 1: 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=31042434&loc=d3e3602-108585

Reference 2: 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 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)

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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.

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