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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Accounts receivable, allowances for doubtful accounts $ 1,049,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 823,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Stockholders' equity:    
Preferred stock, par value (in dollars per share) $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized (in shares) 2,000us-gaap_PreferredStockSharesAuthorized 2,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued (in shares) 883us-gaap_PreferredStockSharesIssued 883us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding (in shares) 883us-gaap_PreferredStockSharesOutstanding 883us-gaap_PreferredStockSharesOutstanding
Preferred stock, liquidation preference $ 6,300,000us-gaap_PreferredStockLiquidationPreferenceValue $ 6,300,000us-gaap_PreferredStockLiquidationPreferenceValue
Common stock, par value (in dollars per share) $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized (in shares) 70,000us-gaap_CommonStockSharesAuthorized 70,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares) 32,661us-gaap_CommonStockSharesIssued 32,837us-gaap_CommonStockSharesIssued
Common stock, shares outstanding (in shares) 32,661us-gaap_CommonStockSharesOutstanding 32,837us-gaap_CommonStockSharesOutstanding