Restricted Net Assets (Details 3)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Operating expenses:        
General and administrative expenses $ (12,701) ¥ (82,272) ¥ (58,071) ¥ (52,565)
Total operating expenses (50,039) (324,140) (333,956) (258,102)
Operating income 1,023 6,628 2,245 53,983
Interest income 1,088 7,045 17,658 11,687
Foreign currency exchange income/(loss), net 56 361 (1,361) 1,935
Other income, net 3,084 19,976 4,572 9,104
Income tax expenses (1,325) (8,586) (3,007) (13,053)
Net income 3,926 25,424 20,107 63,656
Net income 3,926 25,424 20,107 63,656
Other comprehensive (loss)/income:        
Foreign currency translation adjustments, net of tax of RMB nil 667 4,320 1,780 (9,018)
Comprehensive income 4,593 29,744 21,887 54,638
Tax effect of foreign currency translation adjustments   0 0 0
Parent company        
Operating expenses:        
General and administrative expenses (1,875) (12,143) (3,369) (4,461)
Total operating expenses (1,875) (12,143) (3,369) (4,461)
Operating income (1,875) (12,143) (3,369) (4,461)
Share of income of subsidiaries and VIEs 5,013 32,464 20,251 61,151
Interest income 66 428 4,147 4,329
Foreign currency exchange income/(loss), net (63) (409) (1,536) 2,239
Other income, net 785 5,084 614 398
Income before income tax 3,926 25,424 20,107 63,656
Net income 3,926 25,424 20,107 63,656
Net income 3,926 25,424 20,107 63,656
Other comprehensive (loss)/income:        
Foreign currency translation adjustments, net of tax of RMB nil 722 4,674 1,799 (9,083)
Share of other comprehensive income/(loss) of subsidiaries and VIEs, net of tax of RMB nil (55) (354) (19) 65
Other comprehensive (loss)/income 667 4,320 1,780 (9,018)
Comprehensive income $ 4,593 29,744 21,887 54,638
Tax effect of foreign currency translation adjustments   0 0 0
Tax effect of share of other comprehensive income/(loss) of subsidiaries and VIEs   ¥ 0 ¥ 0 ¥ 0