XML 48 R33.htm IDEA: XBRL DOCUMENT
v3.22.1

Liability Related to the Sale of Future Royalties (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Revenue Recognition and Deferred Revenue [Abstract] |
Schedule of Changes in the Liability Related to the Sale of Future Royalties | The following table presents the changes in the liability related to the sale of future royalties under the Revenue Interest Agreement with HCR as of December 31, 2021 (in thousands):
|  | December 31, 2021 |
Liability related to sale of future royalties, beginning balance |  | $ | — |
Proceeds from sale of future royalties, gross |  |  | 50,000 |
Less initial issuance costs (recorded as discount) |  |  | (2,460 | )
Less initial derivative liability (recorded as discount) |  |  | (1,006 | )
Less payments made |  |  | (60 | )
Plus Interest expense accrued/ recognized |  |  | 1,940 |
Liability related to sale of future royalties, ending balance |  | $ | 48,414 |

X
- Definition Schedule of Changes in the Liability Related to the Sale of Future Royalties + References No definition available. + Details
Name: | spro_ScheduleOfChangesInTheLiabilityRelatedToTheSaleOfFutureRoyalties
Namespace Prefix: | spro_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RevenueRecognitionAndDeferredRevenueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration