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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (DEFICIT) - CNY (¥) ¥ in Thousands | Total | Series A Convertible Redeemable Preferred Shares [Member] | Series B Convertible Redeemable Preferred Shares [Member] | Series C Convertible Redeemable Preferred Shares [Member] | Class A [Member] | Class B [Member] | Ordinary Shares [Member] | Ordinary Shares [Member] Class A [Member] | Ordinary Shares [Member] Class A [Member] Series A Convertible Redeemable Preferred Shares [Member] | Ordinary Shares [Member] Class A [Member] Series B Convertible Redeemable Preferred Shares [Member] | Ordinary Shares [Member] Class A [Member] Series C Convertible Redeemable Preferred Shares [Member] | Ordinary Shares [Member] Class B [Member] | Ordinary Shares [Member] Class B [Member] Series A Convertible Redeemable Preferred Shares [Member] | Ordinary Shares [Member] Class B [Member] Series B Convertible Redeemable Preferred Shares [Member] | Ordinary Shares [Member] Class B [Member] Series C Convertible Redeemable Preferred Shares [Member] | Treasury Shares [Member] | Treasury Shares [Member] Series A Convertible Redeemable Preferred Shares [Member] | Treasury Shares [Member] Series B Convertible Redeemable Preferred Shares [Member] | Treasury Shares [Member] Series C Convertible Redeemable Preferred Shares [Member] | Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] Series A Convertible Redeemable Preferred Shares [Member] | Additional Paid-in Capital [Member] Series B Convertible Redeemable Preferred Shares [Member] | Additional Paid-in Capital [Member] Series C Convertible Redeemable Preferred Shares [Member] | Accumulated Other Comprehensive Income (loss) [Member] | Accumulated Other Comprehensive Income (loss) [Member] Series A Convertible Redeemable Preferred Shares [Member] | Accumulated Other Comprehensive Income (loss) [Member] Series B Convertible Redeemable Preferred Shares [Member] | Accumulated Other Comprehensive Income (loss) [Member] Series C Convertible Redeemable Preferred Shares [Member] | Retained Earnings (Accumulated Deficit) [Member] | Retained Earnings (Accumulated Deficit) [Member] Series A Convertible Redeemable Preferred Shares [Member] | Retained Earnings (Accumulated Deficit) [Member] Series B Convertible Redeemable Preferred Shares [Member] | Retained Earnings (Accumulated Deficit) [Member] Series C Convertible Redeemable Preferred Shares [Member]
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Balance at Dec. 31, 2013 | ¥ (407,735) |  |  |  |  |  |  |  |  |  |  | ¥ 107 |  |  |  |  |  |  |  |  |  |  |  | ¥ (1,620) |  |  |  | ¥ (406,222) |  |  |
Balance, shares at Dec. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  | 12,226,558 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 151,850 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 151,850 |  |  |
Conversion of Class B ordinary shares to Class A ordinary shares |  |  |  |  |  |  |  | ¥ 55 |  |  |  | ¥ (55) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Class B ordinary shares to Class A ordinary shares, shares |  |  |  |  |  |  |  | 8,924,365 |  |  |  | (8,924,365) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A ordinary shares upon exercise of share options and vesting of non-vested shares | 1,518 |  |  |  |  |  |  | ¥ 11 |  |  |  |  |  |  |  |  |  |  |  | 1,507 |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A ordinary shares upon exercise of share options and vesting of non-vested shares, shares |  |  |  |  |  |  |  | 1,788,393 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment, net of nil income taxes | (2,896) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,896) |  |  |  |  |  |  |
Share-based compensation | 24,976 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,976 |  |  |  |  |  |  |  |  |  |  |
Accretion of convertible redeemable preferred shares | (3,530) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,030) |  |  |  |  |  |  |  | (500) |  |  |
Issuance of Class A ordinary shares, upon initial public offering (“IPO”), net of issuance cost of RMB24,801, shares |  |  |  |  |  |  |  | 11,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A ordinary shares, upon initial public offering (“IPO”), net of issuance cost of RMB24,801 | 567,360 |  |  |  |  |  | ¥ 71 | ¥ 71 |  |  |  |  |  |  |  |  |  |  |  | 567,289 |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A ordinary shares in private placement concurrent with the IPO | 83,052 |  |  |  |  |  | ¥ 9 | ¥ 9 |  |  |  |  |  |  |  |  |  |  |  | 83,043 |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A ordinary shares in private placement concurrent with the IPO, shares |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of APIC and retained earnings (note 12(d)) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (526,457) |  |  |  |  |  |  |  | 526,457 |  |  |
Conversion of convertible redeemable preferred shares to ordinary shares |  | ¥ 3,648 | ¥ 107,994 | ¥ 592,849 |  |  |  |  |  |  |  |  | ¥ 44 | ¥ 45 | ¥ 68 |  |  |  |  |  | ¥ 3,604 | ¥ 107,949 | ¥ 592,781 |  |  |  |  |  |  |  |
Conversion of convertible redeemable preferred shares to ordinary shares, shares |  |  |  |  |  |  |  |  |  |  |  |  | 7,196,159 | 7,319,820 | 10,914,852 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustment for gains on available for sale securities realized in net income, net of RMB42 income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2014 | 1,119,086 |  |  |  |  |  |  | ¥ 146 |  |  |  | ¥ 209 |  |  |  |  |  |  |  | 851,662 |  |  |  | (4,516) |  |  |  | 271,585 |  |  |
Balance, shares at Dec. 31, 2014 |  |  |  |  |  |  |  | 23,712,758 |  |  |  | 28,733,024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 178,760 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 178,760 |  |  |
Conversion of Class B ordinary shares to Class A ordinary shares |  |  |  |  |  |  |  | ¥ 111 |  |  |  | ¥ (111) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Class B ordinary shares to Class A ordinary shares, shares |  |  |  |  |  |  |  | 18,158,128 |  |  |  | (18,158,128) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A ordinary shares upon exercise of share options and vesting of non-vested shares | 22,456 |  |  |  |  |  |  | ¥ 19 |  |  |  |  |  |  |  |  |  |  |  | 22,437 |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A ordinary shares upon exercise of share options and vesting of non-vested shares, shares |  |  |  |  |  |  |  | 3,043,652 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment, net of nil income taxes | 34,748 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,748 |  |  |  |  |  |  |
Share-based compensation | 32,919 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,919 |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustment for gains on available for sale securities realized in net income, net of RMB42 income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of Class A ordinary shares | (49,355) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (49,355) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2015 | 1,338,614 |  |  |  |  |  |  | ¥ 276 |  |  |  | ¥ 98 |  |  |  | (49,355) |  |  |  | 907,018 |  |  |  | 30,232 |  |  |  | 450,345 |  |  |
Balance, shares at Dec. 31, 2015 |  |  |  |  | 44,914,538 | 10,574,896 |  | 44,914,538 |  |  |  | 10,574,896 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 241,854 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 241,854 |  |  |
Conversion of Class B ordinary shares to Class A ordinary shares |  |  |  |  |  |  |  | ¥ 12 |  |  |  | ¥ (12) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Class B ordinary shares to Class A ordinary shares, shares |  |  |  |  |  |  |  | 1,679,647 |  |  |  | (1,679,647) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A ordinary shares upon exercise of share options and vesting of non-vested shares | 20,388 |  |  |  |  |  |  | ¥ 14 |  |  |  |  |  |  |  |  |  |  |  | 20,374 |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A ordinary shares upon exercise of share options and vesting of non-vested shares, shares |  |  |  |  |  |  |  | 2,141,043 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment, net of nil income taxes | 22,972 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,972 |  |  |  |  |  |  |
Share-based compensation | 67,824 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67,824 |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gains on available-for-sale security, net of RMB42 income taxes | 5,235 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,235 |  |  |  |  |  |  |
Reclassification adjustment for gains on available for sale securities realized in net income, net of RMB42 income taxes | (235) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (235) |  |  |  |  |  |  |
Dividends | (54,026) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (54,026) |  |  |
Purchase of Class A ordinary shares | (44,406) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (44,406) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2016 | ¥ 1,598,220 |  |  |  |  |  |  | ¥ 302 |  |  |  | ¥ 86 |  |  |  | ¥ (93,761) |  |  |  | ¥ 995,216 |  |  |  | ¥ 58,204 |  |  |  | ¥ 638,173 |  |  |
Balance, shares at Dec. 31, 2016 |  |  |  |  | 48,735,228 | 8,895,249 |  | 48,735,228 |  |  |  | 8,895,249 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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