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Ordinary shares (Details) $ / shares in Units, ¥ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2020 CNY (¥) shares | Jun. 17, 2019 USD ($)
Treasury stock, shares, acquired | shares | 1,710,952 | 1,710,952 |
Cost of repurchase | ¥ |  | ¥ 15.1 |
Price per share | $ / shares | $ 1.16 |  |
ADS |  |  |
Treasury stock, shares, acquired | shares | 427,738 | 427,738 |
Cost of repurchase | $ | $ 2.0 |  |
Price per share | $ / shares | $ 4.65 |  |
Stock repurchase program, authorized amount | $ |  |  | $ 20.0

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