Summary of Significant Accounting Policies (Q1) (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2021

Dec. 31, 2020

Summary of Significant Accounting Policies [Abstract]

Schedule of Principal Activities From Which the Company Generates Revenue

The following is a description of principal activities from which the Company generates revenue, as well as a further breakdown of the components of subscription, transaction and services revenues for the three months ended March 31, 2021 and 2020:

	2021		2020
Subscription and transaction fees	$	30,183	$	23,125
Services and other		2,936		1,399
Subscription, transaction and services	$	33,119	$	24,524

The following is a description of principal activities from which the Company generates revenue, as well as a further breakdown of the components of subscription, transaction and services revenues for each year ended December 31:

	2020		2019		2018
Subscription and transaction fees	$	99,609	$	89,476	$	74,725
Services and other		8,960		6,984		4,846
Subscription, transaction and services	$	108,569	$	96,460	$	79,571