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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Schedule of Reserve Shares of Common Stock for Issuance
The Company has reserved shares of common stock for issuance as follows (in thousands):
December 31,
20212020
Stock plans
Shares available for grant
Sunrun-VSI 2014 Equity Incentive Plan11,084 8,940 
2015 Equity Incentive Plan
22,371 15,033 
2015 Employee Stock Purchase Plan
11,270 8,216 
Options outstanding
6,257 8,019 
Restricted stock units outstanding
4,485 7,103 
Total
55,467 47,311