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STOCKHOLDERS' EQUITY (DEFICIT) - Warrants (Details) - $ / shares shares in Thousands | 9 Months Ended
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Sep. 30, 2021
Warrant Or Right Outstanding [Roll Forward] |
Warrants outstanding, beginning balance (in shares) | 2,247
Warrants Issued (in shares) | 0
Warrants Exercised (in shares) | (2,048)
Warrants Expired (in shares) | 0
Warrants outstanding, ending balance (in shares) | 199
Warrants, Expiring March 2023 |
Warrant Or Right Outstanding [Roll Forward] |
Exercise price (in dollars per share) | $ 0.55
Warrants outstanding, beginning balance (in shares) | 1,705
Warrants Issued (in shares) | 0
Warrants Exercised (in shares) | (1,573)
Warrants Expired (in shares) | 0
Warrants outstanding, ending balance (in shares) | 132
Warrants, Expiring November 2022 |
Warrant Or Right Outstanding [Roll Forward] |
Exercise price (in dollars per share) | $ 0.55
Warrants outstanding, beginning balance (in shares) | 487
Warrants Issued (in shares) | 0
Warrants Exercised (in shares) | (475)
Warrants Expired (in shares) | 0
Warrants outstanding, ending balance (in shares) | 12
Warrants, Expiring November 2024 |
Warrant Or Right Outstanding [Roll Forward] |
Exercise price (in dollars per share) | $ 11.83
Warrants outstanding, beginning balance (in shares) | 28
Warrants Issued (in shares) | 0
Warrants Exercised (in shares) | 0
Warrants Expired (in shares) | 0
Warrants outstanding, ending balance (in shares) | 28
Warrants, Expiring November 2024 |
Warrant Or Right Outstanding [Roll Forward] |
Exercise price (in dollars per share) | $ 11.04
Warrants outstanding, beginning balance (in shares) | 27
Warrants Issued (in shares) | 0
Warrants Exercised (in shares) | 0
Warrants Expired (in shares) | 0
Warrants outstanding, ending balance (in shares) | 27

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- Definition Class Of Warrant Or Right, Issued During The Period + References No definition available. + Details
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Namespace Prefix: | sesn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Class Of Warrant Or Right Number Of Expirations During The Period + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
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- Definition Stock Issued During Period Shares Exercise Of Warrants + References No definition available. + Details
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- Definition Warrant Or Right Outstanding [Roll Forward] + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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