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Stock-Based Compensation (Details) - EOS ENERGY STORAGE, LLC [Member] - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock Options      
Options outstanding, beginning balance 6,815,603 5,257,427 3,879,955
Granted 3,623,107 4,422,114 1,708,806
Cancelled/Forfeited (3,721,897) (2,863,938) (331,334)
Options Outstanding, ending balance 6,716,813 6,815,603 5,257,427
Options Exercisable 944,993 2,356,348 3,303,608
Weighted-Average Exercise Price      
Weighted-average exercise price, begining balance $ 0.87 $ 1.51 $ 1.39
Weighted-average exercise price granted 0.50 0.55 1.75
Weighted-average exercise price cancelled/forfeited 1.10 1.51 1.55
Weighted-average exercise price, ending balance 0.54 0.87 1.51
Weighted-average exercise price, exercisable $ 0.73 $ 1.31 $ 1.33
Weighted-Average Remaining Contractual Term (years)      
Outstanding, beginning 5 years 4 months 24 days 2 years 9 months 18 days  
Outstanding, ending 8 years 9 months 18 days 5 years 4 months 24 days 2 years 9 months 18 days
Options Exercisable   1 year 9 months 18 days 2 years 9 months 18 days