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Summary of Significant Accounting Policies - Computation of Diluted Earnings Per Share (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Anti-dilutive common stock options, Number of Shares 304,008us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 309,342us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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Anti-dilutive common stock options, Range of Exercise Price Per Share 0.55emri_AntidilutiveCommonStockOptionsRangeOfExercisePricePerShare
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7.50emri_AntidilutiveCommonStockOptionsRangeOfExercisePricePerShare
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Minimum [Member]    
Anti-dilutive common stock options, Range of Exercise Price Per Share 7.50emri_AntidilutiveCommonStockOptionsRangeOfExercisePricePerShare
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0.55emri_AntidilutiveCommonStockOptionsRangeOfExercisePricePerShare
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