Acquisitions - Additional Information (Details) $ in Millions		1 Months Ended	3 Months Ended	9 Months Ended
	Apr. 01, 2017 USD ($) shares	Apr. 30, 2015 USD ($) Installment shares	Sep. 30, 2015 USD ($) shares	Sep. 30, 2015 USD ($) shares	Oct. 01, 2015 USD ($) shares
Business Acquisition [Line Items]
Business acquisition acquired business to total revenue			$ 7.0	$ 11.1
Scenario Forecast
Business Acquisition [Line Items]
Business acquisition contingent cash payment	$ 9.1
Business acquisition contingent share issuance | shares	600,000
Business acquisition of compensation expenses	2 years
Clean Energy Experts, LLC
Business Acquisition [Line Items]
Cash payment		$ 25.0
Business acquisition shares of common stock | shares		1,900,000
Business acquisition payment of cash			$ 15.0	$ 15.0
Business acquisition, shares issued | shares			1,400,000	1,400,000
Remaining cash of business acquisition		$ 10.0
Remaining shares of business acquisition | shares		500,000
Number of installment | Installment		2
Clean Energy Experts, LLC | Subsequent Event
Business Acquisition [Line Items]
Business acquisition cash to be paid in October 2015 and in April 2016					$ 5.0
Business acquisition shares to be issued in October 2015 and in April 2016 | shares					250,000
Clean Energy Experts, LLC | Scenario Forecast
Business Acquisition [Line Items]
Business acquisition cash to be paid in October 2015 and in April 2016			$ 5.0	$ 5.0
Business acquisition shares to be issued in October 2015 and in April 2016 | shares			250,000	250,000