Stock-based Awards (Tables)

9 Months Ended

Sep. 30, 2017

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

A summary of the Company’s stock option activity for the nine months ended September 30, 2017 is as follows:



	Number of Options		Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Life
					(in years)
Outstanding at December 31, 2016	24,541,512		$	8.29	5.49
Granted	4,812,839		18.41
Exercised	(11,517,023	)	6.29
Canceled/forfeited	(748,821	)	8.68
Outstanding at September 30, 2017	17,088,507		$	12.48	7.90

Schedule of activity in connection with restricted stock

Activity in connection with restricted stock units is as follows for the nine months ended September 30, 2017:



	Number of Shares		Weighted- Average Grant Date Fair Value
Non-vested — December 31, 2016	4,339,320		$	7.85
Granted	2,054,374		18.34
Vested	(1,217,878	)	9.10
Canceled/forfeited	(328,678	)	8.88
Non-vested — September 30, 2017	4,847,138		$	11.91

Schedule of stock-based compensation cost relating to stock options and restricted stock awards

The Company recorded stock-based compensation cost relating to stock options and restricted stock awards in the following categories on the accompanying consolidated statements of comprehensive loss (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016

Cost of revenue	$	339	$	256	$	775	$	711
Sales and marketing	3,358		1,655		7,263		4,154
Technology and development	2,598		1,200		5,496		3,025
General and administrative	3,613		3,130		9,127		10,143
Total stock-based compensation expense	9,908		6,241		22,661		18,033
Amount capitalized to internal software use	443		292		993		760
Total stock-based compensation cost	$	10,351	$	6,533	$	23,654	$	18,793