Revenue Recognition - Revenue by Source (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 177,601	$ 141,396
Total revenue	194,007	156,699
Product
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	137,930	99,559
Total revenue	137,930	99,559
Installation
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	2,659	16,618
Total revenue	2,659	16,618
Service
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	36,417	25,147
Total revenue	36,417	25,147
Electricity
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	595	72
Electricity revenue	16,406	15,303
Total revenue	$ 17,001	$ 15,375