Land Use Rights, Net (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Land Use Rights Net [Abstract]
Estimated usage term period	50 years
Amortization expense	$ 303	$ 302	$ 316
Future amortization expenses, description	Future amortization expense is $302 per year for each of the next five years through December 31, 2025 and thereafter.

Amortization expense is the write-off of an intangible asset over its expected period of use, which reflects the consumption of the asset. This write-off results in the residual asset balance declining over time. The amount of this write-off appears in the income statement, usually within the "depreciation and amortization" line item.

No definition available.

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Period Type:	duration