Acquisitions - Summary of Fair Value of Acquired Intangible Assets and Estimated Useful Life (Details) - Clean Energy Experts, LLC $ in Thousands	9 Months Ended
Sep. 30, 2015 USD ($)
Acquired Finite Lived Intangible Assets [Line Items]
Fair Value	$ 13,290
Developed Technology Rights
Acquired Finite Lived Intangible Assets [Line Items]
Fair Value	$ 5,910
Estimated Useful Life	5 years
Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Fair Value	$ 4,390
Estimated Useful Life	8 years
Trade Names
Acquired Finite Lived Intangible Assets [Line Items]
Fair Value	$ 2,990
Estimated Useful Life	8 years

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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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

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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 55

-Paragraph 37

-URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472

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