Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information Document and Entity Information

v3.20.2
Document and Entity Information Document and Entity Information - shares
6 Months Ended
Jun. 30, 2020
Jul. 31, 2020
Document and Entity Information [Abstract]    
Entity Registrant Name TECOGEN INC.  
Entity Central Index Key 0001537435  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Document Type 10-Q  
Document Period End Date Jun. 30, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   24,850,261
Entity Shell Company false  
Entity Emerging Growth Company false  
Entity Small Business true  
Entity Current Reporting Status Yes