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Restricted cash, non-current	9 Months Ended
	Sep. 30, 2021
Restricted Cash [Abstract]
Restricted cash, non-current	4. Restricted cash, non-current The Group’s restricted cash balance of $743 and $743 as of September 30, 2021 and December 31, 2020, respectively, was long-term bank deposits held as collateral for issuance of letters of credit. These deposits will be released when the related letters of credit are settled by the Group.

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Restricted cash, non-current

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