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Prepaid Expenses and Other Current Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Prepaid Expenses and Other Current Assets.    
Prepaid clinical expenses $ 5eprs_PrepaidClinicalExpensesCurrent $ 599eprs_PrepaidClinicalExpensesCurrent
Prepaid manufacturing expenses 457eprs_PrepaidManufacturingExpensesCurrent 194eprs_PrepaidManufacturingExpensesCurrent
Prepaid other expenses 633us-gaap_OtherPrepaidExpenseCurrent 85us-gaap_OtherPrepaidExpenseCurrent
Other current assets 461us-gaap_OtherAssetsCurrent 10us-gaap_OtherAssetsCurrent
Total prepaid and other current assets $ 1,556us-gaap_PrepaidExpenseAndOtherAssetsCurrent $ 888us-gaap_PrepaidExpenseAndOtherAssetsCurrent