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Nature of the Business (Details)	12 Months Ended
	Dec. 31, 2020 item
Nature of the Business and Basis of Presentation
Number of collaborations	2

X

- Definition

The number of agreements or collaborations.

+ References

No definition available.

+ Details

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Namespace Prefix:	srrk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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