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Commitments and Contingencies - Litigation, Governmental Investigations (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Mar. 31, 2017
item
Dec. 31, 2016
KFTC investigation      
Contingencies      
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