Goodwill and Amortizable Intangible Assets - Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Cost	$ 4,818	$ 5,708
Accumulated Amortization	2,349	2,953
Amortizable intangible assets, net	2,469us-gaap_FiniteLivedIntangibleAssetsNet	2,755us-gaap_FiniteLivedIntangibleAssetsNet
Member List [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	1,670	1,670
Accumulated Amortization	464	394
Amortizable intangible assets, net	1,206	1,276
Finite-Lived Intangible Assets, Remaining Amortization Period	4 years 110 days	4 years 219 days
Content [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	140	140
Accumulated Amortization	78	66
Amortizable intangible assets, net	62	74
Finite-Lived Intangible Assets, Remaining Amortization Period	1 year 110 days	1 year 219 days
Core Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	110	110
Accumulated Amortization	61	52
Amortizable intangible assets, net	49	58
Finite-Lived Intangible Assets, Remaining Amortization Period	1 year 110 days	1 year 219 days
Data Acquisition Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	2,598	3,488
Accumulated Amortization	1,638	2,358
Amortizable intangible assets, net	960	1,130
Finite-Lived Intangible Assets, Remaining Amortization Period	1 year 146 days	1 year 73 days
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	300	300
Accumulated Amortization	108	83
Amortizable intangible assets, net	$ 192	$ 217
Finite-Lived Intangible Assets, Remaining Amortization Period	1 year 329 days	2 years 73 days

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

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)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

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

+ References

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- Definition

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

+ References

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- Definition

Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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