Revenue Recognition - Revenue by Source (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 212,160	$ 172,316	$ 389,761	$ 313,712
Total revenue	228,470	187,856	422,477	344,555
Product
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	146,867	116,197	284,797	215,756
Total revenue	146,867	116,197	284,797	215,756
Installation
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	28,879	29,839	31,538	46,457
Total revenue	28,879	29,839	31,538	46,457
Service
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	35,707	26,208	72,124	51,355
Total revenue	35,707	26,208	72,124	51,355
Electricity
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	707	72	1,302	144
Electricity revenue	16,310	15,540	32,716	30,843
Total revenue	$ 17,017	$ 15,612	$ 34,018	$ 30,987