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CONSOLIDATED BALANCE SHEETS (Parenthetical) ¥ in Thousands | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2018 CNY (¥) shares
--- | --- | ---
Accounts receivable, allowance of doubtful accounts | ¥ | ¥ 0 | ¥ 0
Treasury stock, shares | 1,485,862 | 0
Ordinary shares Class A |  |
Common stock, shares authorized | 800,000,000 | 800,000,000
Common stock, shares issued | 96,588,106 | 91,088,106
Common stock, shares outstanding | 92,120,024 | 91,088,106
Ordinary shares Class B |  |
Common stock, shares authorized | 72,000,000 | 72,000,000
Common stock, shares issued | 72,000,000 | 72,000,000
Common stock, shares outstanding | 72,000,000 | 72,000,000

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