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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Stock-based compensation |
Schedule of the stock-based compensation |
|  | Year Ended December 31, |
|  | 2014 |  | 2015 |  | 2016 |
|  | (In thousands) |
Cost of revenues |  | $ | 755 |  | $ | 1,196 |  | $ | 2,616 |
Sales and marketing |  | 1,583 |  | 3,209 |  | 5,357 |
Product development |  | 4,392 |  | 10,210 |  | 15,076 |
General and administrative |  | 7,049 |  | 11,784 |  | 13,853 |
|  | $ | 13,779 |  | $ | 26,399 |  | $ | 36,902 |
Summary of the number of shares available for issuance |
|  | Shares Available |
|  | (In thousands) |
December 31, 2013 |  | 4,648 |
Addition |  | 1,000 |
Granted* |  | (2,951 | )
Cancelled/expired/forfeited |  | 41 |
December 31, 2014 |  | 2,738 |
Addition |  | 21,684 |
Granted* |  | (4,851 | )
Cancelled/expired/forfeited |  | 646 |
December 31, 2015 |  | 20,217 |
Addition |  | — |
Granted* |  | (1,917 | )
Cancelled/expired/forfeited |  | 578 |
December 31, 2016 |  | 18,878 |
* In 2014, 3.0 million restricted share units and no options were granted under the 2014 Plan. In 2015, 4.9 million restricted share units and no options were granted under the 2014 Plan. In 2016, 1.9 million restricted share units and no options were granted under the 2014 Plan.
Summary of option activities under the Company' stock option program |
|  | Options Outstanding |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life |  | Aggregate Intrinsic Value |
|  | (In thousands) |  |  |  | (In years) |  | (In thousands) |
December 31, 2013 |  | 18,561 |  | $ | 1.17 |  | 4.3 |  | $ | 239,975 |
Granted |  | — |  | $ | — |  |  |  |  |
Exercise |  | (3,697 | ) | $ | 0.52 |  |  |  |  |
Cancelled/expired/forfeited |  | (534 | ) | $ | 2.84 |  |  |  |  |
Repurchased |  | — |  | $ | — |  |  |  |  |
December 31, 2014 |  | 14,330 |  | $ | 1.28 |  | 3.2 |  | $ | 185,684 |
Granted |  | — |  | $ | — |  |  |  |  |
Exercise |  | (7,309 | ) | $ | 1.11 |  |  |  |  |
Cancelled/expired/forfeited |  | (718 | ) | $ | 3.22 |  |  |  |  |
Repurchased |  | — |  | $ | — |  |  |  |  |
December 31, 2015 |  | 6,303 |  | $ | 1.26 |  | 2.4 |  | $ | 114,975 |
Granted |  | — |  | $ | — |  |  |  |  |
Exercise |  | (3,625 | ) | $ | 1.10 |  |  |  |  |
Cancelled/expired/forfeited |  | (91 | ) | $ | 3.37 |  |  |  |  |
Repurchased |  | — |  | $ | — |  |  |  |  |
December 31, 2016 |  | 2,587 |  | $ | 1.41 |  | 1.6 |  | $ | 101,403 |
Vested and expected to vest as of December 31, 2015 |  | 6,237 |  | $ | 1.24 |  | 2.4 |  | $ | 113,909 |
Exercisable as of December 31, 2015 |  | 5,649 |  | $ | 1.01 |  | 2.2 |  | $ | 104,473 |
Vested and expected to vest as of December 31, 2016 |  | 2,572 |  | $ | 1.40 |  | 1.6 |  | $ | 100,819 |
Exercisable as of December 31, 2016 |  | 2,433 |  | $ | 1.28 |  | 1.4 |  | $ | 95,678 |
Schedule of stock options outstanding |
Range of Exercise Prices |  | Options Outstanding |  | Weighted Average Exercise Price |  | Options Exercisable |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life |
|  | (In thousands) |  |  |  | (In thousands) |  |  |  | (In years) |
As of December 31, 2015 |  |  |  |  |  |  |  |  |  |  |
$0.36 - $0.41 |  | 4,167 |  | $ | 0.36 |  | 4,167 |  | $ | 0.36 |  | 1.7 |
$0.96 - $1.80 |  | 406 |  | $ | 1.24 |  | 406 |  | $ | 1.24 |  | 2.3 |
$3.25 - $3.36 |  | 682 |  | $ | 3.32 |  | 519 |  | $ | 3.33 |  | 3.5 |
$3.43 - $3.50 |  | 1,048 |  | $ | 3.48 |  | 557 |  | $ | 3.48 |  | 4.6 |
|  | 6,303 |  | $ | 1.26 |  | 5,649 |  | $ | 1.01 |  | 2.2 |
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
$0.36 - $0.41 |  | 1,639 |  | $ | 0.36 |  | 1,639 |  | $ | 0.36 |  | 0.7 |
$0.96 - $1.80 |  | 79 |  | $ | 0.97 |  | 79 |  | $ | 0.97 |  | 1.2 |
$3.25 - $3.36 |  | 341 |  | $ | 3.33 |  | 338 |  | $ | 3.33 |  | 2.5 |
$3.43 - $3.50 |  | 528 |  | $ | 3.48 |  | 377 |  | $ | 3.48 |  | 3.7 |
|  | 2,587 |  | $ | 1.41 |  | 2,433 |  | $ | 1.28 |  | 1.6 |
Performance-based restricted share units |
Stock-based compensation |
Summary of restricted share unit activities |
|  | Shares Granted |  | Weighted-Average Grant Date Fair Value |
|  | (In thousands) |  |  |
December 31, 2015 |  | — |  | $ | — |
Awarded |  | 111 |  | $ | 27.00 |
Cancelled |  | (3 | ) | $ | 27.00 |
December 31, 2016 |  | 108 |  | $ | 27.00 |
Service-based restricted share units |
Stock-based compensation |
Summary of restricted share unit activities |
|  | Shares Granted |  | Weighted- Average Grant Date Fair Value |
|  | (In thousands) |  |  |
December 31, 2013 |  | 800 |  | $ | 13.19 |
Awarded |  | 2,951 |  | $ | 17.11 |
Vested |  | (203 | ) | $ | 13.19 |
Cancelled |  | (41 | ) | $ | 17.23 |
December 31, 2014 |  | 3,507 |  | $ | 16.44 |
Awarded |  | 4,851 |  | $ | 12.41 |
Vested |  | (1,211 | ) | $ | 14.69 |
Cancelled |  | (646 | ) | $ | 14.18 |
December 31, 2015 |  | 6,501 |  | $ | 13.98 |
Awarded |  | 1,806 |  | $ | 24.94 |
Vested |  | (2,274 | ) | $ | 14.73 |
Cancelled |  | (575 | ) | $ | 14.58 |
December 31, 2016 |  | 5,458 |  | $ | 17.23 |

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