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Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Consolidated Balance Sheets [Abstract]    
Accounts receivable, allowances $ 595,827us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 531,205us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Equipment and improvements, accumulated depreciation and amortization 7,481,760us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 7,681,863us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Identifiable intangible assets, accumulated amortization 11,377,437us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 10,631,372us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Convertible preferred stock, par value per share $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Convertible preferred stock, shares authorized 1,468,750us-gaap_PreferredStockSharesAuthorized 1,468,750us-gaap_PreferredStockSharesAuthorized
Convertible preferred stock, shares issued 73,332us-gaap_PreferredStockSharesIssued 73,332us-gaap_PreferredStockSharesIssued
Convertible preferred stock, shares outstanding 73,332us-gaap_PreferredStockSharesOutstanding 73,332us-gaap_PreferredStockSharesOutstanding
Convertible preferred stock, liquidation preference $ 3,222,368us-gaap_PreferredStockLiquidationPreferenceValue  
Common stock, par value per share $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 50,000,000us-gaap_CommonStockSharesAuthorized 50,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 25,710,990us-gaap_CommonStockSharesIssued 25,319,203us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 25,710,990us-gaap_CommonStockSharesOutstanding 25,319,203us-gaap_CommonStockSharesOutstanding