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Goodwill (Details) (USD $)
1 Months Ended
Nov. 30, 2013
Sep. 30, 2014
Dec. 31, 2013
Changes in goodwill      
Balance at beginning of the period   $ 11,613,000 $ 11,613,000
Change in goodwill related to the acquisition of Callidus 11,600,000    
Balance at end of the period   $ 11,613,000 $ 11,613,000