XML 130 R59.htm IDEA: XBRL DOCUMENT
v3.22.2.2

STOCKHOLDERS' EQUITY DEFICIT - Warrants (Details) - $ / shares shares in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2019
Class of Warrant or Right [Line Items] |  |  |
Exercise price per warrant (in dollars per share) |  |  | $ 1.47
Warrant Or Right Outstanding [Roll Forward] |  |  |
Warrants outstanding, beginning balance (in shares) | 199 | 2,247 |
Warrants Issued (in shares) | 0 | 0 |
Warrants Exercised (in shares) | 0 | (2,048) |
Warrants Cancelled (in shares) | 0 | 0 |
Warrants outstanding, ending balance (in shares) | 199 | 199 |
Warrants, Expiring June 2020 |  |  |
Class of Warrant or Right [Line Items] |  |  |
Exercise price per warrant (in dollars per share) |  | $ 1.47 |
Warrant Or Right Outstanding [Roll Forward] |  |  |
Warrants outstanding, beginning balance (in shares) | 0 | 0 |
Warrants Issued (in shares) |  | 0 |
Warrants Exercised (in shares) |  | 0 |
Warrants Cancelled (in shares) |  | 0 |
Warrants outstanding, ending balance (in shares) |  | 0 |
Warrants, Expiring March 2023 |  |  |
Class of Warrant or Right [Line Items] |  |  |
Exercise price per warrant (in dollars per share) | $ 0.55 | $ 0.55 |
Warrant Or Right Outstanding [Roll Forward] |  |  |
Warrants outstanding, beginning balance (in shares) | 132 | 1,705 |
Warrants Issued (in shares) | 0 | 0 |
Warrants Exercised (in shares) | 0 | (1,573) |
Warrants Cancelled (in shares) | 0 | 0 |
Warrants outstanding, ending balance (in shares) | 132 | 132 |
Warrants, Expiring November 2022 |  |  |
Class of Warrant or Right [Line Items] |  |  |
Exercise price per warrant (in dollars per share) | $ 0.55 | $ 0.55 |
Warrant Or Right Outstanding [Roll Forward] |  |  |
Warrants outstanding, beginning balance (in shares) | 12 | 487 |
Warrants Issued (in shares) | 0 | 0 |
Warrants Exercised (in shares) | 0 | (475) |
Warrants Cancelled (in shares) | 0 | 0 |
Warrants outstanding, ending balance (in shares) | 12 | 12 |
Warrants, Expiring November 2024, Issued May 2015 |  |  |
Class of Warrant or Right [Line Items] |  |  |
Exercise price per warrant (in dollars per share) | $ 11.83 | $ 11.83 |
Warrant Or Right Outstanding [Roll Forward] |  |  |
Warrants outstanding, beginning balance (in shares) | 28 | 28 |
Warrants Issued (in shares) | 0 | 0 |
Warrants Exercised (in shares) | 0 | 0 |
Warrants Cancelled (in shares) | 0 | 0 |
Warrants outstanding, ending balance (in shares) | 28 | 28 |
Warrants, Expiring November 2024, Issued November 2014 |  |  |
Class of Warrant or Right [Line Items] |  |  |
Exercise price per warrant (in dollars per share) | $ 11.04 | $ 11.04 |
Warrant Or Right Outstanding [Roll Forward] |  |  |
Warrants outstanding, beginning balance (in shares) | 27 | 27 |
Warrants Issued (in shares) | 0 | 0 |
Warrants Exercised (in shares) | 0 | 0 |
Warrants Cancelled (in shares) | 0 | 0 |
Warrants outstanding, ending balance (in shares) | 27 | 27 |

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

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

X
- Definition Stock Issued During Period Shares Exercise Of Warrants + References No definition available. + Details
Name: | sesn_StockIssuedDuringPeriodSharesExerciseOfWarrants
Namespace Prefix: | sesn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warrant Or Right Outstanding [Roll Forward] + References No definition available. + Details
Name: | sesn_WarrantOrRightOutstandingRollForward
Namespace Prefix: | sesn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=sesn_WarrantsExpiringJune2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=sesn_WarrantsExpiringMarch2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=sesn_WarrantsExpiringNovember2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=sesn_WarrantsExpiringNovember2024IssuedMay2015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=sesn_WarrantsExpiringNovember2024IssuedNovember2014Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |