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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]
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