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Restricted cash, non-current | 6 Months Ended
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Jun. 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 June 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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