v3.19.3
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2019
Nov. 12, 2019
Entity Registrant Name Real Goods Solar, Inc.  
Entity Central Index Key 0001425565  
Trading Symbol rgse  
Current Fiscal Year End Date --12-31  
Document Type 10-Q  
Document Period End Date Sep. 30, 2019  
Amendment Flag false  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Class A Common Stock    
Entity Common Stock, Shares Outstanding   120,612,570
Class B common stock    
Entity Common Stock, Shares Outstanding   0