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
 1 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2015
KRW (₩)
May. 31, 2013
USD ($)
Loss Contingencies [Line Items]          
Rent expense for operating leases   $ 1,500,000 $ 777,000    
Minimum monthly purchase amount         $ 40,000
Minimum annual purchase amount $ 3,300,000   $ 3,300,000    
Purchase commitment term 3 years        
Purchase commitment renewal term 3 years        
Korean Business Segment | Other Noncurrent Assets          
Loss Contingencies [Line Items]          
Distributor claims reserve   $ 190,000   ₩ 223