Variable Interest Entity (VIE) - Summary of Assets and Liability of Consolidated VIE (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets consolidated gross	$ 188	$ 2,699
Accumulated depreciation	112	216
Total net assets consolidated	76	2,483
Building [Member]
Assets consolidated gross		1,856
Office Equipment [Member]
Assets consolidated gross	63	248
Land [Member]
Assets consolidated gross		510
Variable Interest Entity, Primary Beneficiary [Member]
Accumulated depreciation		148
Liabilities assumed		1,790
Total net assets consolidated		613
Variable Interest Entity, Primary Beneficiary [Member] \| Building [Member]
Assets consolidated gross		1,856
Variable Interest Entity, Primary Beneficiary [Member] \| Office Equipment [Member]
Assets consolidated gross		185
Variable Interest Entity, Primary Beneficiary [Member] \| Land [Member]
Assets consolidated gross		$ 510

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