Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Components of accrued liabilities
Accrued compensation and related charges	$ 3,625	$ 4,417
Preferred stock dividends payable	2,901	2,901
Accrued product warranty	792	609
Payable in connection with land restoration of Nanjing JinMei factory	758	750
Accrued professional services	634	675
Current portion of operating lease liabilities	466	445
Advance from customers	258	374
Payable in connection with construction	222	1,457
Other personnel-related costs	193	101
Accrued income taxes	163	760
Other tax payable	106	295
Accrual for sales returns	33	81
Payable in connection with repurchase of subsidiaries shares		1,439
Other accrued liabilities	1,396	1,691
Accrued liabilities, Total	$ 11,547	$ 15,995

Amount of current obligation payable in connection with decontamination of anjing JinMei factory.

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Amount of current obligation payable to noncontrolling interests for subsidiary shares.

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Amount of current obligation payable in connection with constructions.

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Represents the current portion of other personnel-related costs.

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Value of preferred stock dividends payable as of the balance sheet date. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer, classified as current.

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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