Sunrun Inc. Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation expense recognized	$ 170,587	$ 26,306	$ 27,856
Stock-based compensation expense capitalized	6,500
Cost of customer agreements and incentives
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation expense recognized	4,315	2,434	2,568
Cost of solar energy systems and product sales
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation expense recognized	1,582	844	718
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation expense recognized	53,366	5,162	7,191
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation expense recognized	2,518	1,439	1,253
General and administration
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation expense recognized	$ 108,806	$ 16,427	$ 16,126