Description of Business - Additional Information (Details)	Nov. 23, 2020 Business
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condition for future business combination number of businesses minimum	1

The minimum number of businesses which the reporting entity must acquire with the net proceeds of the offering.

No definition available.

Name:	smrt_ConditionForFutureBusinessCombinationNumberOfBusinessesMinimum
Namespace Prefix:	smrt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration