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v3.22.0.1

SUBSEQUENT EVENTS (Details) - Subsequent Event | 2 Months Ended
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Feb. 28, 2022 interview document
Subsequent Event [Line Items] |
Review period | 5 months
Number of documents reviewed | document | 600,000
Number of interviews | interview | 39

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- Definition Number Of Documents Reviewed + References No definition available. + Details
Name: | sesn_NumberOfDocumentsReviewed
Namespace Prefix: | sesn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number Of Interviews + References No definition available. + Details
Name: | sesn_NumberOfInterviews
Namespace Prefix: | sesn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Review Period + References No definition available. + Details
Name: | sesn_ReviewPeriod
Namespace Prefix: | sesn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |