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Summary of significant accounting policies - Fixed Assets (Details)	12 Months Ended
	Dec. 31, 2019
Computer equipment and software
Fixed assets
Estimated useful life	3 years
Furniture, fixtures, machinery and lab equipment
Fixed assets
Estimated useful life	7 years

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=ptct_ComputerEquipmentAndSoftwareMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Data Type:	na
Balance Type:
Period Type: