Summary of Significant Accounting Policies (Details 6) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Software and Website Development Costs
Property and equipment, gross	$ 50,655,000us-gaap_PropertyPlantAndEquipmentGross	$ 27,092,000us-gaap_PropertyPlantAndEquipmentGross
Accumulated amortization	19,924,000	11,854,000
Amortization expense
Total property and equipment, net	30,731,000us-gaap_PropertyPlantAndEquipmentNet	15,238,000us-gaap_PropertyPlantAndEquipmentNet
Software Costs
Software and Website Development Costs
Estimated useful life	3 years
Property and equipment, gross	29,700,000	16,200,000
Accumulated amortization	11,900,000	6,400,000
Capitalized software development costs written off	300,000	1,600,000
Accumulated amortization written off	100,000	900,000
Acceleration of amortization	200,000	700,000
Amortization expense
2015	8,043,000
2016	6,238,000
2017	3,477,000
Total property and equipment, net	$ 17,758,000

Represents the amount of accelerated amortization related to certain assets written off during the period.

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Amount of amortization expense related to property, plant and equipment with a finite life expected to be recognized during the next fiscal year following the latest fiscal year.

+ References

No definition available.

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Amount of amortization expense related to property, plant and equipment with a finite life expected to be recognized during the third fiscal year following the latest fiscal year.

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No definition available.

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Amount of amortization expense related to property, plant and equipment with a finite life expected to be recognized during the second fiscal year following the latest fiscal year.

+ References

No definition available.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.14)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 14

-Article 5

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The decrease in accumulated depreciation, depletion and amortization (relating to property, plant and equipment) as a result of sales or disposals of property, plant and equipment during the period.

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Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 1

-Subparagraph (b)

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-Name Accounting Standards Codification

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-Section S99

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (SX 210.5-02.13)

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-Publisher SEC

-Name Regulation S-X (SX)

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-Section 02

-Paragraph 13

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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