Name:	espr_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodForRemainingGrantAmount
Namespace Prefix:	espr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the period from adoption of plan date that an equity-based award are granted.

No definition available.

Name:	espr_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantPeriod
Namespace Prefix:	espr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the annual increase in number of shares of stock reserved and available for issuance under a share-based award plan by the specified percentage of the number of shares of stock issued and outstanding on the immediately preceding the end date.

No definition available.

Name:	espr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorizedAsPercentageOfSharesIssuedAndOutstanding
Namespace Prefix:	espr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the period from cessation of employment within which options expire if not exercised.

No definition available.

Name:	espr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodFromCessationOfEmploymentWithinWhichOptionsExpireIfNotExercised
Namespace Prefix:	espr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Number of additional shares authorized for issuance under share-based payment arrangement.

No definition available.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Number of shares authorized for issuance under share-based payment arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Percentage of vesting of award under share-based payment arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Purchase price of common stock expressed as a percentage of its fair value.

No definition available.