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Stock-Based Compensation (Tables)

12 Months Ended

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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