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Maximum amount the employee may contribute to an employee stock purchase plan.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Maximum percentage of employee gross pay the employee may contribute to an employee stock purchase plan.

No definition available.

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Data Type:	num:percentItemType
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Period Type:	duration

The discount at which shares may be purchased under the employee stock purchase plan, calculated as a stated percentage of the lesser of the closing price of the Company's common stock on the NASDAQ Global Select Market (i) on the first trading day of the offering period or (ii) the last day of any offering period.

No definition available.

Name:	espr_EmployeeStockPurchasePlanPercentageDiscountOnShares
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Data Type:	num:percentItemType
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Period Type:	duration

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-Publisher FASB
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Aggregate number of common shares reserved for future issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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.

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Data Type:	xbrli:stringItemType
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Number of shares issued 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
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