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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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Amount of allowance for credit loss on accounts receivable, classified as current.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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