Quarterly report pursuant to Section 13 or 15(d)

Commitments and contingencies

Commitments and contingencies
6 Months Ended
Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Commitments and contingencies Commitments and Contingencies     We guarantee certain obligations of EuroSite Power Inc, a former subsidiary of American DG Energy Inc. These guarantees include a payment performance guarantee in respect of collateralized equipment financing loans, with a remaining principal amount outstanding subject to the guarantee at June 30, 2021 of approximately $29,013 due ratably in equal installments through September 2021, and certain guarantees of performance in respect of certain customer contracts. Based on current conditions, we do not believe there to be any amounts probable of payment by us under any of the guarantees and have estimated the value associated with the non-contingent aspect of the guarantees is approximately $7,000 which is recorded as a liability in the condensed consolidated balance sheets.