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Land Use Rights - Summary of Land Use Rights Recorded at net Carrying Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Cost $ 1,787 $ 1,710
Less: Accumulated amortization (215) (201)
Total $ 1,572 $ 1,509