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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On August 2, 2016, Tecogen Inc. (the "Company") exercised 2,000,000 warrants (the "Ultratek Warrants"), in their joint venture Ultra Emissions Technologies Limited (the "JV"), at $1.00 per share, for an aggregate amount of $2 million. The funds used to exercise the Ultratek Warrants were acquired by the Company from the holders of certain Company warrants (the "Tecogen Warrant Holders"), when they partially exercised their Tecogen warrants (the "Tecogen Warrants"), in July of 2016. The Tecogen Warrant Holders exercised a total of 650,000 Tecogen Warrants with a $4.00 exercise price, resulting in an influx of $2.7 million to the Company, which the Company then used some of the proceeds to invest in their JV.