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v3.20.2

Subsequent Events (Details) - USD ($) |  | 6 Months Ended
--- | --- | ---
Jun. 11, 2020 | Jun. 30, 2020
Subsequent Event [Line Items] |  |
Sale of stock, number of shares issued in transaction (in shares) |  | 100,847,810
SOBI Purchase Agreement |  |
Subsequent Event [Line Items] |  |
Sale of stock, number of shares issued in transaction (in shares) | 5,416,390 |
Share price (in dollars per share) | $ 4.6156 |
Sale of stock, percentage of ten-day volume weighted average price of common stock | 120.00% |
Sale common stock | $ 25,000,000 |
Collaborative Arrangement |  |
Subsequent Event [Line Items] |  |
Upfront cash payment | 75,000,000 |
Sales milestone payments | $ 630,000,000 |

X
- Definition License And Option Agreement, Sales Milestone Payments That May Be Received + References No definition available. + Details
Name: | selb_LicenseAndOptionAgreementSalesMilestonePaymentsThatMayBeReceived
Namespace Prefix: | selb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition License And Option Agreement, Upfront Cash Payment + References No definition available. + Details
Name: | selb_LicenseAndOptionAgreementUpfrontCashPayment
Namespace Prefix: | selb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sale of Stock, Percentage Of Ten-Day Volume Weighted Average Price Of Common Stock + References No definition available. + Details
Name: | selb_SaleofStockPercentageOfTenDayVolumeWeightedAveragePriceOfCommonStock
Namespace Prefix: | selb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
Name: | us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- 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

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=selb_SOBIPurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=us-gaap_CollaborativeArrangementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |