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Cash and cash equivalents (Tables) | 12 Months Ended
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Dec. 31, 2020
Cash and cash equivalents |
Summary of Cash on Hand and Cash Held at Bank | Cash and cash equivalents represent cash on hand, cash held at bank, and time deposits placed with banks or other financial institutions, which have original maturities of three months or less. Cash on hand and cash held at bank balance as of December 31, 2019 and 2020 primarily consist of the following currencies:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019 | ​ | December 31, 2020
​ |  | ​ |  | USD |  | ​ |  | USD
(In thousands) | ​ | Amount | ​ | equivalent | ​ | Amount | ​ | equivalent
RMB |  | 322,972 |  | 46,296 |  | 312,581 |  | 47,906
USD |  | 115,805 |  | 115,805 |  | 89,050 |  | 89,050
Hong Kong Dollar |  | 2,202 |  | 283 |  | 1,737 |  | 224
THB |  | 2,417 |  | 81 |  | 2,052 |  | 68
Total |  | ​ |  | 162,465 |  | ​ |  | 137,248

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