Concentration, Credit and Other Risks (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Dec. 31, 2015
CNY (¥)
Concentration, credit and other risks          
Total assets     ¥ 633,177   ¥ 980,003
Total liabilities     409,772   707,727
Payable to third parties     270,533   566,639
Payable to Group entities     139,239   141,088
Net revenue $ 110,157 ¥ 713,572 613,990 ¥ 492,606  
Net income 3,926 25,424 20,107 63,656  
Net cash provided by operating activities 7,618 49,347 77,198 166,967  
Net cash used in investing activities (16,990) (110,059) 70,258 (111,747)  
Net cash provided by financing activities 24,186 156,674 (183,627) (73,234)  
Effect of exchange rate changes on cash and cash equivalents 723 4,681 415 (7,082)  
Net (decrease)/increase in cash and cash equivalents 15,537 ¥ 100,643 (35,756) (25,096)  
Property and equipment, intangible assets and goodwill of VIEs          
Property and equipment, net 13,033   91,694   84,423
Intangible assets, net 229   3,610   1,482
Goodwill $ 122   789   789
Original maturity term of available-for-sale securities which were placed with a financial institution 1 month 1 month      
Consolidated variable interest entities and VIE's subsidiaries          
Concentration, credit and other risks          
Net revenue   ¥ 713,889 614,239 492,799  
Net income   36,140 25,133 61,608  
Inter-company service fees paid/payable   23,962 11,615 9,278  
Net cash provided by operating activities   47,368 90,925 151,318  
Net cash used in investing activities   (119,332) (97,104) (87,916)  
Net cash provided by financing activities   150,000      
Effect of exchange rate changes on cash and cash equivalents   313 134 (180)  
Net (decrease)/increase in cash and cash equivalents   ¥ 78,349 (6,045) ¥ 63,222  
Property and equipment, intangible assets and goodwill of VIEs          
Property and equipment, net     91,208   83,921
Intangible assets, net     3,610   1,482
Goodwill     ¥ 789   ¥ 789