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CONSOLIDATED BALANCE SHEETS (Parenthetical)
¥ in Thousands
Dec. 31, 2016
CNY (¥)
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
CNY (¥)
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Current assets:        
Cash ¥ 810,672   ¥ 513,938  
Property and equipment, net 437,337   127,864  
Investments, Fair Value Disclosure 15,000  
Long-term Investments 41,760   24,000  
Other non-current assets 91,849   53,111  
Current liabilities:        
Income taxes payable 91,240   56,293  
Accrued expenses and other current liabilities 117,867   79,835  
Other non-current liabilities ¥ 7,043   ¥ 9,333  
Common Class A [Member]        
Ordinary shares        
Ordinary shares, par value | $ / shares   $ 0.001   $ 0.001
Authorized | shares 860,000,000 860,000,000 860,000,000 860,000,000
Issued | shares 48,735,228 48,735,228 44,914,538 44,914,538
Outstanding | shares 47,160,248 47,160,248 43,988,425 43,988,425
Treasury shares | shares 1,574,980 1,574,980 926,113 926,113
Common Class B [Member]        
Ordinary shares        
Ordinary shares, par value | $ / shares   $ 0.001   $ 0.001
Authorized | shares 40,000,000 40,000,000 40,000,000 40,000,000
Issued | shares 8,895,249 8,895,249 10,574,896 10,574,896
Outstanding | shares 8,895,249 8,895,249 10,574,896 10,574,896
VIE [Member]        
Current assets:        
Cash ¥ 630   ¥ 1,043  
Property and equipment, net 3   18  
Investments, Fair Value Disclosure  
Long-term Investments 35,000   18,000  
Other non-current assets 716   266  
Current liabilities:        
Income taxes payable 3,729   3,737  
Accrued expenses and other current liabilities 176   892  
Other non-current liabilities ¥ 267   ¥ 267