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Cash and Cash Equivalents - Schedule of Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash and Cash Equivalents [Abstract]        
Cash $ 38,053 $ 38,474    
Money market funds 20,069 20,010    
Total cash and cash equivalents $ 58,122 $ 58,484 $ 58,289 $ 17,748