Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Allocation of Stock-Based Compensation

Stock-Based Compensation

	Three		Three		Six		Six
	Months		Months		Months		Months
	Ended		Ended		Ended		Ended
	June 30,		June 30,		June 30,		June 30,
	2019		2018		2019		2018
Stock-based compensation:
Cost of revenue	$	179	$	167	$	361	$	322
Sales and marketing		489		411		1,008		756
Research, development and engineering		357		350		711		648
General and administrative		927		814		1,839		1,615
Intellectual property		64		67		134		139
Stock-based compensation expense		2,016		1,809		4,053		3,480
Capitalized to software and patent costs		49		49		90		93
Total stock-based compensation	$	2,065	$	1,858	$	4,143	$	3,573

Unrecognized Compensation Cost Related to Non-Vested Stock-Based Awards Granted

The following table sets forth total unrecognized compensation cost related to non-vested stock-based awards granted under all equity compensation plans:

	As of		As of
	June 30,		December 31,
	2019		2018
Total unrecognized compensation costs	$	15,205	$	14,055

Weighted Average Period for Recognition of Unrecognized Compensation Cost for Stock Options and Restricted Stock

The Company expects to recognize the total unrecognized compensation costs as of June 30, 2019 for stock options and restricted stock over weighted average periods through June 30, 2023 as follows:

	Stock	Restricted
	Options	Stock
Weighted average period	0.99 years	1.53 years

Reconciliation of Outstanding Balance of Stock Options

The following table reconciles the outstanding balance of stock options:

				Weighted		Weighted
				Average		Average		Aggregate
				Exercise		Grant Date		Intrinsic
Three months ended June 30, 2019:	Options			Price		Fair Value		Value
Outstanding at March 31, 2019		503		$	28.89	$	13.26
Granted		—			—		—
Exercised		(13	)		14.99		8.12
Forfeited or expired		—			—		—
Outstanding at June 30, 2019		490		$	29.26	$	13.40	$	7,414

				Weighted		Weighted
				Average		Average		Aggregate
				Exercise		Grant Date		Intrinsic
Six months ended June 30, 2019:	Options			Price		Fair Value		Value
Outstanding at December 31, 2018		513		$	28.52	$	13.10
Granted		—			—		—
Exercised		(23	)		12.77		6.81
Forfeited or expired		—			—		—
Outstanding at June 30, 2019		490		$	29.26	$	13.40	$	7,414
Exercisable at June 30, 2019		332		$	28.88			$	5,144
Unvested at June 30, 2019		158		$	30.05			$	2,270

Reconciliation of Unvested Balance of Restricted Stock

The following table reconciles the unvested balance of restricted stock:

				Weighted
				Average
	Number of			Grant Date
Three months ended June 30, 2019:	Shares			Fair Value
Unvested balance, March 31, 2019		628		$	26.59
Granted		18		$	32.75
Vested		(76	)	$	27.61
Forfeited		(45	)	$	27.13
Unvested balance, June 30, 2019		525		$	26.61

				Weighted
				Average
	Number of			Grant Date
Six months ended June 30, 2019:	Shares			Fair Value
Unvested balance, December 31, 2018		426		$	28.85
Granted		273		$	23.93
Vested		(128	)	$	28.13
Forfeited		(46	)	$	27.13
Unvested balance, June 30, 2019		525		$	26.61

Fair Value of Restricted Stock Awards Vested

The following table indicates the fair value of all restricted stock awards that vested:

	Three		Three		Six		Six
	Months		Months		Months		Months
	Ended		Ended		Ended		Ended
	June 30,		June 30,		June 30,		June 30,
	2019		2018		2019		2018
Fair value of restricted stock awards vested	$	3,992	$	2,016	$	5,232	$	3,272