Gain from Sale of Priority Review Voucher - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
F D A
Gain From Sale Of Intangible Asset [Line Items]
Proceeds from sale of rare pediatric disease priority review voucher, Net of commission	$ 102.0	$ 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