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Foreign Currency Gain (Loss), Net	9 Months Ended
Foreign Currency Gain (Loss), Net	Sep. 30, 2020
Foreign Currency [Abstract]
Foreign Currency Gain (Loss), Net	13. Foreign Currency Gain (Loss), Net Net foreign currency gain or loss includes non-cash translation gain or loss associated with intercompany balances. A substantial portion of the Company’s net foreign currency gain or loss is non-cash translation gain or loss associated with intercompany long-term loans to the Company’s Korean subsidiary. The loans are denominated in U.S. dollars and are affected by changes in the exchange rate between the Korean won and the U.S. dollar. As of September 30, 2020 and December 31, 2019, the outstanding intercompany loan balances including accrued interest between the Korean subsidiary and the Dutch subsidiary were $445,991 thousand and $686,485 thousand, respectively. The Korean won to U.S. dollar exchange rates were 1,173.5:1 and 1,157.8:1 using the first base rate as of September 30, 2020 and December 31, 2019, respectively, as quoted by the KEB Hana Bank.