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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net revenues |  | ¥ 1,579,604 | ¥ 1,178,008 | ¥ 836,941
Cost of revenues | [1] | (449,104) | (333,559) | (240,084)
Gross profit |  | 1,130,500 | 844,449 | 596,857
Selling and marketing expenses | [1] | (527,553) | (384,954) | (261,489)
General and administrative expenses | [1] | (307,519) | (251,298) | (183,998)
Research and development expenses | [1] | (65,594) | (50,515) | (33,454)
Operating income |  | 229,834 | 157,682 | 117,916
Interest income |  | 23,974 | 42,732 | 26,802
Other income |  | 15,960 | 11,812 | 14,568
Loss on foreign currency forward contract |  | (12,898) |  |
Foreign currency exchange gains (losses) |  | 3,760 | (29,499) | 7,359
Income before income taxes |  | 260,630 | 182,727 | 166,645
Income tax expense |  | (18,776) | (3,967) | (14,795)
Net income |  | 241,854 | 178,760 | 151,850
Accretion of convertible redeemable preferred shares |  |  |  | (3,530)
Net income attributable to Class A and Class B ordinary shareholders |  | ¥ 241,854 | ¥ 178,760 | ¥ 148,320
Basic earnings per Class A and Class B ordinary share |  | ¥ 4.35 | ¥ 3.32 | ¥ 3.11
Diluted earnings per Class A and Class B ordinary share |  | ¥ 4.10 | ¥ 3.04 | ¥ 2.69
Net income |  | ¥ 241,854 | ¥ 178,760 | ¥ 151,850
Other comprehensive income (loss) |  |  |  |
Foreign currency translation adjustment, net of nil income taxes |  | 22,972 | 34,748 | (2,896)
Unrealized holding gains on available for sale securities, net of RMB42 income taxes |  | 5,235 |  |
Less: reclassification adjustment for gains on available for sale securities realized in net income, net of RMB42 income taxes |  | (235) |  |
Comprehensive income |  | ¥ 269,826 | ¥ 213,508 | ¥ 148,954
[1] | Includes share-based compensation expense as follows (note 14):

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