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Commitments and Contingencies - Litigation, Governmental Investigations (Details)
1 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
May 30, 2017
item
KFTC investigation          
Contingencies          
Accruals for potential contingencies       $ 0  
Number of bids under investigation | item         3
Fine assessed   $ 15,000      
Minimum | KFTC investigation          
Contingencies          
Period of suspension or restriction 3 months        
Maximum | Korea          
Contingencies          
Sales to governmental agencies as a percentage of total revenue     1.00%    
Maximum | KFTC investigation          
Contingencies          
Period of suspension or restriction 6 months        
Legal          
Contingencies          
Accruals for potential contingencies $ 0   $ 0 $ 0