Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity

A summary of stock option activity for the year ended December 31, 2019 is as follows:

	Shares Under Option		Weighted- Average Exercise Price		Weighted- Average Contractual Life	Aggregate Intrinsic Value
	(in thousands)					(in thousands)
Outstanding at December 31, 2018	3,488		$	7.06
Granted	1,184		$	4.98
Exercised	(285	)	$	1.99
Expired	(47	)	$	13.36
Forfeited	(78	)	$	2.74
Outstanding at December 31, 2019	4,262		$	6.82	6.9 years	$	11,825
Exercisable at December 31, 2019	2,420		$	8.62	5.6 years	$	4,995

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The Company estimates the fair value of stock options that contain service and/or performance conditions using the Black-Scholes option pricing model. The weighted-average input assumptions used by the Company were as follows:

	Year Ended
	December 31, 2019		December 31, 2018
Expected term (in years)	6.1		6.0
Risk-free interest rate	2.55	%	2.67	%
Expected volatility	60	%	57	%
Dividend yield	—	%	—	%

Nonvested Restricted Stock Shares Activity

A summary of restricted stock activity for the year ended December 31, 2019 is as follows:

	Number of Shares		Weighted-Average Grant Date Fair Value
	(in thousands)
Nonvested shares of restricted stock outstanding at December 31, 2018	197		$	12.06
Granted	—		$	—
Canceled	(182	)	$	12.71
Vested	(13	)	$	13.74
Nonvested shares of restricted stock outstanding at December 31, 2019	2		$	13.49

Schedule of Nonvested Restricted Stock Units Activity

A summary of restricted stock unit activity for the year ended December 31, 2019 is as follows:

	Number of Shares		Weighted-Average Grant Date Fair Value
	(in thousands)
Nonvested restricted stock units outstanding at December 31, 2018	6,100		$	3.56
Granted	5,341		$	5.09
Canceled	(506	)	$	3.94
Vested	(2,858	)	$	3.82
Nonvested restricted stock units outstanding at December 31, 2019	8,077		$	4.46

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs for all Plans

Total stock-based compensation expense recorded in the consolidated statements of operations was as follows:  

	Year Ended
	December 31, 2019		December 31, 2018
	(in thousands)
Cost of revenue	$	421	$	321
Sales and marketing	5,638		4,557
Technology and development	4,757		2,867
General and administrative	8,009		8,139
Restructuring and other exit costs	—		398
Total stock-based compensation expense	$	18,825	$	16,282