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Acquisitions - Future Amortization Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Acquisitions      
Intangible assets, net $ 1,100 $ 1,966  
Amortization expense 700 $ 1,500 $ 1,200
Future estimated amortization expenses      
2017 616    
2018 484    
2019 and thereafter 0    
Total expected amortization expense $ 1,100