Name:	spro_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsAggregateIntrinsicValueRollforwards
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Share based compensation arrangement by share based payment award non option equity instruments weighted average contractual term.

No definition available.

Name:	spro_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageContractualTermRollforwards
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Share based compensation arrangement by share based payment award non option equity instruments weighted average strike price.

No definition available.

Name:	spro_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageStrikePriceRollForward
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Share based compensation arrangement by share based payment award non options outstanding intrinsic value.

No definition available.

Name:	spro_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsOutstandingIntrinsicValue
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Data Type:	xbrli:monetaryItemType
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Share based compensation arrangement by share based payment award non options outstanding weighted average exercise price.

No definition available.

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Data Type:	num:perShareItemType
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Share based compensation arrangement by share based payment award options outstanding weighted average remaining contractual term.

No definition available.

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Share based compensation arrangements by share based payment award non options cancelled in period weighted average exercise price.

No definition available.

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Share based compensation arrangements by share based payment award non options forfeitures in period weighted average exercise price.

No definition available.

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Share based compensation arrangements by share based payment award non options grants in period weighted average exercise price.

No definition available.

Name:	spro_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionsGrantsInPeriodWeightedAverageExercisePrice
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Data Type:	num:perShareItemType
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Number of shares under non-option equity instrument agreements for which rights to exercise lapsed.

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Data Type:	xbrli:sharesItemType
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Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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Data Type:	xbrli:sharesItemType
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Net number of non-option equity instruments granted to participants.

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Data Type:	xbrli:sharesItemType
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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.