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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net loss $ (5,562)us-gaap_NetIncomeLoss $ (6,375)us-gaap_NetIncomeLoss
Other comprehensive income:    
Unrealized gain on marketable securities, net of tax expense of $8 for the three months March 31, 2015 and $248 for the three months ended March 31, 2014 16us-gaap_UnrealizedGainLossOnSecurities 402us-gaap_UnrealizedGainLossOnSecurities
Other comprehensive income 16us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent 402us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Total comprehensive loss $ (5,546)us-gaap_ComprehensiveIncomeNetOfTax $ (5,973)us-gaap_ComprehensiveIncomeNetOfTax