CONDENSED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical)	Jun. 24, 2019 shares
Private Placement Warrants [Member]
Stockholders' Equity
Warrants issued (in shares)	6,954,500
Initial Public Offering [Member]
Stockholders' Equity
Units issued (in shares)	25,000,000

Number of new units issued during the period. Each unit consists of one share of Class A common stock and one redeemable warrant.

No definition available.

Name:	smmc_UnitsIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	smmc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration