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Leases - Narrative (Details)	May 31, 2022
Leases [Abstract]
Sublease term	18 months
Sublease extension term	6 months

X

- Definition

Lessee, Operating Sublease, Renewal Term

+ References

No definition available.

+ Details

Name:	surf_LesseeOperatingSubleaseRenewalTerm
Namespace Prefix:	surf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Lessee, Operating Sublease, Term of Contract

+ References

No definition available.

+ Details

Name:	surf_LesseeOperatingSubleaseTermOfContract
Namespace Prefix:	surf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration