Intangible Assets and Goodwill- Additional Information (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) Segment	Jun. 30, 2016 Segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 30, 2014 USD ($)
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets		$ 901		$ 13,172	$ 14,911
Amortization of intangible assets recorded in cost of revenue					$ 100
Market capitalization	$ 283,000			1,000,000
Number of reporting segments | Segment		2	2
Impairment of goodwill and intangible assets	$ 36,600	$ 36,601		4,506
Projected future cash flow		30 years
Estimated percentage of customer contract renewals		90.00%
Estimated customer contract period		20 years
Discount rate for cash flows related to customer contracts		7.25%
Discount rate for estimated cash flows for customer renewals		9.25%
Percentage of varied discount rate which would not impact result of first impairment test		1.00%
Residential reporting unit, excess of fair value over carrying value		15.00%
Goodwill				36,601
Solmetric's SunEye and PV Designer Products
Finite Lived Intangible Assets [Line Items]
Impairment charges of intangible assets excluding goodwill related to ceased operations		$ 0		4,500		$ 0
Solmetric's SunEye and PV Designer Products | In Process Research And Development
Finite Lived Intangible Assets [Line Items]
Impairment charges of intangible assets excluding goodwill related to ceased operations				2,100
Solmetric's SunEye and PV Designer Products | Trade Names
Finite Lived Intangible Assets [Line Items]
Impairment charges related to ceased operations				1,300
Solmetric's SunEye and PV Designer Products | Customer Relationships
Finite Lived Intangible Assets [Line Items]
Impairment charges related to ceased operations				400
Solmetric's SunEye and PV Designer Products | Developed Technology
Finite Lived Intangible Assets [Line Items]
Impairment charges related to ceased operations				$ 700