Gain from Sale of Priority Review Voucher - Additional Information (Detail) $ in Millions	9 Months Ended
Sep. 30, 2021 USD ($)
P R V
Gain From Sale Of Intangible Asset [Line Items]
Proceeds from sale of rare pediatric disease priority review voucher, Net of commission	$ 102.0
F D A
Gain From Sale Of Intangible Asset [Line Items]
Proceeds from sale of rare pediatric disease priority review voucher, Net of commission	$ 108.1

Proceeds from sale of rare pediatric disease priority review voucher, Net of commission.

No definition available.

Name:	srpt_ProceedsFromSaleOfRarePediatricDiseasePriorityReviewVoucherNetOfCommission
Namespace Prefix:	srpt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration