Share-Based Awards (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Option Award and Stock Appreciation Rights Activity

The following table summarizes option award and stock appreciation rights activity for the year ended December 31, 2015 and has been retroactively adjusted to reflect the effects of the Class C Stock Split:

	Number of Shares Subject to Existing Options and Stock Appreciation Rights			Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2015		17,399,292		$	18.12		5.32	$	311,040
Assumed Trulia options and stock appreciation rights in connection with February 2015 acquisition of Trulia		3,159,765			13.79
Granted		11,438,095			31.45
Exercised		(2,732,767	)		8.99
Forfeited or cancelled		(2,138,011	)		28.37
Outstanding at December 31, 2015		27,126,374			23.35		5.96		156,025
Vested and exercisable at December 31, 2015		9,470,685			14.44		3.93		112,923

Fair Value of Options Granted, Excluding Stock Option Grant Program of Nonemployee Directors and Executives, Estimated at Date of Grant Using Black Scholes Merton Option Pricing Model

The fair value of options granted, excluding options granted under the Stock Option Grant Program for Nonemployee Directors (“Nonemployee Director Awards”) and certain options granted to the Company’s executives in January and February 2015 and January 2013, is estimated at the date of grant using the Black-Scholes-Merton option-pricing model with the following assumptions for the periods presented:

	Year Ended December 31,
	2015	2014	2013
Expected volatility	54% – 56%	53% – 57%	50% – 54%
Expected dividend yield	—	—	—
Risk-free interest rate	1.03% – 1.48%	1.37% – 1.55%	0.70% – 1.27%
Weighted-average expected life	3.50 – 4.58 years	4.58 years	4.58 years
Weighted-average fair value of options granted	$13.77	$14.78	$7.09

Summary of Restricted Stock Award Activity

The following table summarizes restricted stock award activity for the year ended December 31, 2015 and has been retroactively adjusted to reflect the effects of the Class C Stock Split:

	Shares of Restricted Stock			Weighted- Average Grant- Date Fair Value
Unvested outstanding at January 1, 2015		260,505		$	10.75
Granted		4,173			40.45
Vested		(233,732	)		11.07
Forfeited or cancelled		—			—
Unvested outstanding at December 31, 2015		30,946			12.35

Summary of Restricted Stock Units Activity

The following table summarizes activity for restricted stock units for the year ended December 31, 2015 and has been retroactively adjusted to reflect the effects of the Class C Stock Split:

	Restricted Stock Units			Weighted- Average Grant- Date Fair Value
Unvested outstanding at January 1, 2015		376,806		$	28.56
Assumed Trulia restricted stock units in connection with February 2015 acquisition of Trulia		3,798,957			36.38
Granted		1,354,185			28.55
Vested		(1,899,531	)		31.74
Forfeited or cancelled		(1,024,903	)		31.12
Unvested outstanding at December 31, 2015		2,605,514			32.36

Effects of Share Based Compensation in Consolidated Statements of Operations

The following table presents the effects of share-based compensation in our consolidated statements of operations during the periods presented (in thousands):

	Year Ended December 31,
	2015		2014		2013
Cost of revenue	$	4,694	$	1,844	$	737
Sales and marketing		25,391		7,320		10,969
Technology and development		26,849		11,681		4,660
General and administrative		48,280		13,240		7,070
Restructuring costs		14,859		—		—
	$	120,073	$	34,085	$	23,436