Fair Value Measurements (Details) - USD ($)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Fair value measurements
Transfer of assets between levels	$ 0	$ 0
Transfer of liabilities between levels	0	0
Recurring fair value measurement
Fair value measurements
Total assets at fair value	68,847,000	152,560,000
Recurring fair value measurement \| Money market funds
Fair value measurements
Total assets at fair value	68,445,000	105,078,000
Recurring fair value measurement \| Certificates of deposit
Fair value measurements
Total assets at fair value	402,000	401,000
Recurring fair value measurement \| U.S. treasury notes
Fair value measurements
Total assets at fair value		47,081,000
Recurring fair value measurement \| Level 1
Fair value measurements
Total assets at fair value	68,847,000	152,560,000
Recurring fair value measurement \| Level 1 \| Money market funds
Fair value measurements
Total assets at fair value	68,445,000	105,078,000
Recurring fair value measurement \| Level 1 \| Certificates of deposit
Fair value measurements
Total assets at fair value	402,000	401,000
Recurring fair value measurement \| Level 1 \| U.S. treasury notes
Fair value measurements
Total assets at fair value		47,081,000
Recurring fair value measurement \| Level 2
Fair value measurements
Total assets at fair value	0	0
Recurring fair value measurement \| Level 2 \| Money market funds
Fair value measurements
Total assets at fair value	0	0
Recurring fair value measurement \| Level 2 \| Certificates of deposit
Fair value measurements
Total assets at fair value	0	0
Recurring fair value measurement \| Level 2 \| U.S. treasury notes
Fair value measurements
Total assets at fair value		0
Recurring fair value measurement \| Level 3
Fair value measurements
Total assets at fair value	0	0
Recurring fair value measurement \| Level 3 \| Money market funds
Fair value measurements
Total assets at fair value	0	0
Recurring fair value measurement \| Level 3 \| Certificates of deposit
Fair value measurements
Total assets at fair value	$ 0	0
Recurring fair value measurement \| Level 3 \| U.S. treasury notes
Fair value measurements
Total assets at fair value		$ 0

Represents the transfer of assets between the levels of fair value hierarchy that have taken place during the period.

No definition available.

Name:	espr_FairValueMeasurementAssetTransfersBetweenLevels
Namespace Prefix:	espr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the transfer of liabilities between the levels of fair value hierarchy that have taken place during the period.

+ References

No definition available.

+ Details

Name:	espr_FairValueMeasurementLiabilityTransfersBetweenLevels
Namespace Prefix:	espr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-3

+ Details

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

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CertificatesOfDepositMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: