Schedule of Prepaid expenses and current assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Prepaid Expenses And Current Assets
Prepayment of fixed assets	$ 1,294	$ 295
Prepayment of inventory	415	73
Other	188	382
Total prepaid expenses and current assets	$ 1,897	$ 750

Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant