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Members' Equity (FY) (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2021

Dec. 31, 2020

Members' Equity [Abstract]

Issuances of Class A-3 and Class B Unit Activities

A summary of the Class P Unit activity for the nine months ended September 30, 2021 is as follows:

		Number of Units
Outstanding Class A-3 and Class B Units, December 31, 2020			274,816
Repurchases			(8,279	)
Cancellations			(4,288	)
Outstanding Class A-3 and Class B Units, June 15, 2021 (Pre-Business Combination)			262,249
Class A-3 Units outstanding exchanged for Class A Units in connection with the Business Combination			(53,333	)
Recapitalization in connection with the Business Combination			25,687,126
Outstanding Class P Units, June 16, 2021			25,896,042
Cancellations			(216,920	)
Outstanding Class P Units, September 30, 2021			25,679,122
Vested, September 30, 2021			23,197,454

The following presents issuances of Class A-3 and Class B Units during the years ended December 31, 2020, 2019 and 2018:

Outstanding at December 31, 2017			252,241
Granted			44,125
Repurchase			(12,391	)
Cancellations			(38,604	)
Outstanding at December 31, 2018			245,371
Granted			25,990
Cancellations			(7,284	)
Outstanding at December 31, 2019			264,077
Granted			14,250
Repurchase			(1,900	)
Cancellations			(1,611	)
Outstanding at December 31, 2020			274,816
Vested as of December 31, 2019			207,398
Vested as of December 31, 2020			234,114

Unvested Class A-3 and Class B Units

The following presents a summary of unvested Class A-3 and Class B Units during the years ended December 31, 2020, 2019 and 2018:

						Weighted - Average
		Units				Grant Date Fair Value				Remaining Years to Vest				Remaining Unrecognized
Nonvested, December 31, 2018			62,024			$	236.37				3.09			$	12,215,953
Granted			25,990				531.80
Vested			(24,051	)			231.74
Cancelled			(7,284	)			238.87
Nonvested, December 31, 2019			56,679			$	373.47				2.65			$	18,682,331
Granted			14,250				724.28
Vested			(28,616	)			359.45
Cancelled			(1,611	)			450.83
Nonvested, December 31, 2020			40,702			$	518.13				2.38			$	22,474,033

Valuation Assumptions

The fair value of Class A-3 and B-Units granted were estimated on their respective grant dates using the Black-Scholes-Merton option pricing model and the following assumptions for the years ended December 31, 2020, 2019 and 2018:

	​	​	2018	​	​	2019	​	​	2020
Volatility	​	​	70%	​	​	70%	​	​	50% - 70%
Risk - free interest rate	​	​	2.65% - 2.90%	​	​	1.68% - 2.49%	​	​	0.21% - 0.29%
Dividend yield	​	​	0.00%	​	​	0.00%	​	​	0.00%
Expected life of option (in years)	​	​	4 years	​	​	4 years	​	​	4 years
Weighted - average fair value of common stock	​	​	$305.35	​	​	$531.80	​	​	$724.28

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Tabular disclosure of the changes in outstanding nonvested shares.

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