Organization and Nature of Business (FY) (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2021

Dec. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Change in Previously Reported Line Items in the Statements of Cash Flows

The following table presents the effect of the change in presentation to the previously reported line items for the nine months ended September 30, 2020:

	Nine Months Ended September 30, 2020
	As Previously Reported		Adjustment		Revised
Cash flows from financing activities:
Change in customer funds payable	$	—	$	1,528	$	1,528
Net cash provided by financing activities		14,306		1,528		15,834
Net increase in cash, cash equivalents, and restricted cash		8,759		1,528		10,287
Cash, cash equivalents, and restricted cash, beginning of period		4,736		21,126		25,862
Cash, cash equivalents, and restricted cash, end of period	$	13,495	$	22,654	$	36,149

The following tables present the effect of the change in presentation to the previously reported line items in the Statements of Cash Flows for each period indicated:

	Year Ended December 31, 2020								Year Ended December 31, 2019						Year Ended December 31, 2018
	As Previously								As Previously						As Previously
	Reported		Adjustment			Revised			Reported		Adjustment		Revised		Reported			Adjustment		Revised
Cash flows from financing activities:
Change in customer funds payable	$	—	$	(202	)	$	(202	)	$	—	$	3,505	$	3,505	$	—		$	2,854	$	2,854
Net cash provided by financing activities		15,156		(202	)		14,954			19,268		3,505		22,773		(1,143	)		2,854		1,711
Net increase in cash, cash equivalents, and restricted cash		13,183		(202	)		12,981			1,341		3,505		4,846		(31,646	)		2,854		(28,792	)
Cash, cash equivalents, and restricted cash, beginning of period		4,736		21,126			25,862			3,395		17,621		21,016		35,041			14,767		49,808
Cash, cash equivalents, and restricted cash, end of period	$	17,919	$	20,924		$	38,843		$	4,736	$	21,126	$	25,862	$	3,395		$	17,621	$	21,016