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Restricted cash, non-current	6 Months Ended
Jun. 30, 2020
Restricted cash, non-current
Restricted cash, non-current	4.Restricted cash, non-current The Group’s restricted cash balance is $510 and $510 as of December 31, 2019 and June 30, 2020, respectively. It was mainly 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.

Restricted cash, non-current

6 Months Ended

Jun. 30, 2020

4.Restricted cash, non-current

The Group’s restricted cash balance is $510 and $510 as of December 31, 2019 and June 30, 2020, respectively. It was mainly 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.