Contingently Redeemable Preferred Units (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2020

Dec. 31, 2019

EOS ENERGY STORAGE, LLC [Member]

Schedule of activity attributable to the preferred units

	Preferred Units
		Units	Amount
Balance, December 31, 2019		80,707	$	109,365
Contributions allocated to preferred units		10,598		1,759
Issuance of preferred units		15,000		7,500
Balance, September 30, 2020		106,305	$	118,624

	Preferred Units
	Units	Amount
Balance, December 31, 2018	68,716	$	105,548
Discount on convertible notes, beneficial conversion feature	—		1,799
Contributions allocated to preferred units	7,506		1,289
Balance, September 30, 2019	76,222	$	108,636

	Preferred Units
	Units	Amount
Balance, December 31, 2017	50,970	$	74,776
Contributions	14,367		24,854
Conversion of notes payable	3,379		5,918
Balance, December 31, 2018	68,716	$	105,548
Contributions allocated to preferred units	11,991		2,031
Discount on convertible notes, beneficial conversion feature	—		1,786
Balance, December 31, 2019	80,707	$	109,365