Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Narrative (Details)

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Commitments and Contingencies - Narrative (Details)
₩ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
KRW (₩)
Loss Contingencies [Line Items]        
Rent expense for operating leases $ 1,800,000 $ 1,500,000 $ 777,000  
Minimum monthly purchase amount 40,000      
Minimum annual purchase amount $ 9,400,000      
Purchase commitment term 3 years      
Purchase commitment renewal term 3 years      
Korean Business Segment | Other Noncurrent Assets        
Loss Contingencies [Line Items]        
Distributor claims reserve $ 185,000     ₩ 223