Land Use Right - Expected Amortization Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Land use right, net
Remainder of 2018	$ 124
2019	248
2020	248
2021	248
2022	248
2023 and thereafter	11,016
Land use right, net	$ 12,132	$ 12,465

Amount of legal rights after accumulated amortization to use or benefit from the use of land.

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- Definition

Land Use Right, Net [Abstract]

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- Definition

Amount of expected amortization expense for land use rights net, to be recognized after year five following the latest fiscal year.

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- Definition

Amount of expected amortization expense for land use rights net, to be recognized in the remainder of the fiscal year following the latest fiscal year.

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- Definition

Amount of expected amortization expense for land use rights net, to be recognized in the year five following the latest fiscal year.

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Amount of expected amortization expense for land use rights net, to be recognized in the year four following the latest fiscal year.

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Amount of expected amortization expense for land use rights net, to be recognized in the year three following the latest fiscal year.

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Amount of expected amortization expense for land use rights net, to be recognized in the year two following the latest fiscal year.

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