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Restructuring - Narrative (Details) (USD $) | Nov. 01, 2013 | Dec. 31, 2013 | Dec. 31, 2014
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Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges | $ 1,332,186 us-gaap_RestructuringReserve |  |
Stock-based compensation from accelerated vesting |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges |  | 376,365 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = epm_StockBasedCompensationMember |
Accrued restructuring charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges |  | $ 955,821 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | $ 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember

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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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