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License, Collaboration and Service Agreements - Schedule of remaining potential milestone payments (Details) $ in Millions | Jun. 30, 2024 USD ($)
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Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Milestone payment | $ 225.0
Sales milestone events | 1,000.0
NDA Submission [Member] | Maximum [Member] |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Milestone payment | 25.0
Potential Commercial Milestone Payments | Maximum [Member] |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Milestone payment | $ 150.0

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- Definition Milestone payment upon submission of a new drug application. + References No definition available. + Details
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Namespace Prefix: | spro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Sales milestone events + References No definition available. + Details
Name: | spro_SalesMilestoneEvents
Namespace Prefix: | spro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 808 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479402/808-10-50-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |