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Cash and Cash Equivalents - Schedule of Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash and Cash Equivalents [Abstract]        
Cash $ 48,855 $ 38,053    
Money market funds 20,092 20,069    
Total cash and cash equivalents $ 68,947 $ 58,122 $ 58,484 $ 58,289