Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended
Mar. 31, 2020
Summary of Significant Accounting Policiies
Period in which uncollectible interest due to become delinquent	90 days

Represents period in which uncollectible interest due to become delinquent.

No definition available.

Name:	icpt_PeriodForDelinquentOfUncollectibleInterestDues
Namespace Prefix:	icpt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration