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Summary of Significant Accounting Policies (Details 4) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other comprehensive income (loss):      
Balance at the beginning of the period $ 383 $ 3,022  
Foreign currency translation adjustment (1,665) (1,245) $ 425
Unrealized holding losses on corporate debt securities   (98) 279
Realized gain on redemption of corporate debt securities (loss)   (1,296)  
Balance at the end of the period (1,282) 383 3,022
Foreign currency      
Other comprehensive income (loss):      
Balance at the beginning of the period 383 1,628  
Foreign currency translation adjustment (1,665) (1,245)  
Balance at the end of the period $ (1,282) 383 1,628
Available for sale securities      
Other comprehensive income (loss):      
Balance at the beginning of the period   1,394  
Unrealized holding losses on corporate debt securities   (98)  
Realized gain on redemption of corporate debt securities (loss)   $ (1,296)  
Balance at the end of the period     $ 1,394