Accrued and Other Current Liabilities, and Other Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accrued and Other Current Liabilities, and Other Liabilities
Payroll and welfare payable	$ 2,275	$ 3,336
Payables related to property and equipment	3,423	3,288
Lease liabilities-current	$ 1,038	$ 1,061
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued and other current liabilities	Accrued and other current liabilities
Value-added tax and other tax payable	$ 614	$ 639
Deferred income-current	57	60
Other	169	13
Accrued and other current liabilities	7,576	8,397
Profit-sharing liability to Juventas	12,562	13,220
Lease liabilities-noncurrent	$ 858	$ 1,105
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities	Other Liabilities
Other Liabilities	$ 13,420	$ 14,325