Stock-based Awards (Tables)

6 Months Ended

Jun. 30, 2014

Stock-based Awards

Summary of stock option activity

				Weighted-
		Weighted-		Average
		Average		Remaining
	Number of	Exercise		Contract Life
	Options	Price		(in years)
Outstanding at December 31, 2013	18,363,144	$	4.89	7.17
Granted	10,545,647	$	15.86
Exercised	(1,741,058)	$	1.01
Canceled/forfeited	(502,943)	$	9.36
Outstanding at June 30, 2014	26,664,790	$	9.40	7.98
Vested and expected to vest at June 30, 2014	25,236,587	$	9.32	7.91
Exercisable at June 30, 2014	18,884,427	$	8.72	7.39

Summary of restricted stock unit activity

		Weighted-
		Average
	Number of	Grant Date
	Shares	Fair Value
Non-vested — December 31, 2013	—	$	—
Granted	720,146	$	10.04
Vested	—	$	—
Canceled/forfeited	(6,607)	$	9.63
Non-vested — June 30, 2014	713,539	$	10.04

Stock-based compensation cost categories

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2014		2013		2014		2013
Cost of revenue	$	113	$	28	$	163	$	53
Sales and marketing		1,307		580		2,344		1,104
Technology and development		1,156		443		1,865		783
General and administrative		4,819		992		7,168		1,676
Total stock-based compensation expense		7,395		2,043		11,540		3,616
Amount capitalized to internal software use		321		145		614		251
Total stock-based compensation cost	$	7,716	$	2,188	$	12,154	$	3,867