Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Weighted Average Assumptions Used in Estimating Fair Value of Stock Options

	As of December 31,
	2019			2018			2017
Valuation assumptions:
Expected dividend yield		0	%		0	%		0	%
Expected volatility		40.78	%		37.60	%		39.37	%
Expected term (years)		5.96			5.86			6.06
Risk-free interest rate		2.1	%		2.6	%		1.9	%

Summary of Outstanding Stock Option Activity

A summary of the Company’s stock option activity is as follows (shares in thousands):

	Number of shares			Weighted average exercise price		Weighted average remaining contractual term
Balance at December 31, 2018		1,407		$	8.73
Granted		782			11.77
Exercised		(176	)		4.20
Expired/Forfeited		(413	)		11.45
Balance at December 31, 2019		1,600			9.98		7.8
Vested and exercisable at December 31, 2019		746		$	8.39		6.6
Vested and expected to vest at December 31, 2019		1,600		$	9.98		7.8

Summary of Outstanding Restricted Stock Unit Activity

The following table summarizes the Company’s Restricted Stock Unit activity (shares in thousands):

	Restricted stock units			Weighted average grant date fair value
Non-vested balance at December 31, 2018		4		$	13.67
Grants		96			11.35
Vested		(1	)		13.67
Forfeitures		(18	)		11.35
Non-vested balance at December 31, 2019		80			11.43