Stock-based Awards (Tables)

6 Months Ended

Jun. 30, 2019

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

Summary of stock option activity

A summary of the Company’s stock option activity for the six months ended June 30, 2019 is as follows:

	Number of Options		Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Life
					(in years)
Outstanding at December 31, 2018	14,114,651		$	12.32	7.0
Granted	2,022,047		7.06
Exercised	(355,147	)	7.98
Forfeited/expired	(2,701,845	)	12.96
Outstanding at June 30, 2019	13,079,706		$	11.50	6.8

Schedule of activity in connection with restricted stock

Activity in connection with restricted stock units is as follows for the six months ended June 30, 2019:

	Number of Shares		Weighted- Average Grant Date Fair Value
Non-vested — December 31, 2018	5,375,963		$	11.01
Granted	4,498,063		6.80
Vested	(1,704,577	)	9.63
Forfeited	(1,468,517	)	9.91
Non-vested — June 30, 2019	6,700,932		$	8.77

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 units in the following categories on the accompanying consolidated statements of comprehensive loss (in thousands):

	Three Months Ended   June 30,				Six Months Ended   June 30,
	2019		2018		2019		2018
Cost of revenue	$	553	$	443	$	1,052	$	741
Sales and marketing	4,716		3,543		8,188		6,670
Technology and development	3,463		2,698		5,409		5,051
General and administrative	6,824		2,288		9,542		5,607
Total stock-based compensation expense	15,556		8,972		24,191		18,069
Amount capitalized to internal software use	505		473		978		807
Total stock-based compensation cost	$	16,061	$	9,445	$	25,169	$	18,876