Acquisitions - Summary of Fair Value of Acquired Intangible Assets and Estimated Useful Life (Details) - Clean Energy Experts, LLC $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Acquired Finite Lived Intangible Assets [Line Items]
Fair Value	$ 13,290
Developed Technology
Acquired Finite Lived Intangible Assets [Line Items]
Fair Value	$ 5,910
Estimated Useful Life (in years)	5 years
Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Fair Value	$ 4,390
Estimated Useful Life (in years)	8 years
Trade Names
Acquired Finite Lived Intangible Assets [Line Items]
Fair Value	$ 2,990
Estimated Useful Life (in years)	8 years