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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-based Compensation

	Three		Three
	Months		Months
	Ended		Ended
	March 31,		March 31,
	2018		2017
Stock-based compensation:
Cost of revenue	$	155	$	176
Sales and marketing		345		368
Research, development and engineering		298		308
General and administrative		801		573
Intellectual property		72		78
Stock-based compensation expense		1,671		1,503
Capitalized to software and patent costs		44		45
Total stock-based compensation	$	1,715	$	1,548

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
	March 31,		December 31,
	2018		2017
Total unrecognized compensation costs	$	17,072	$	13,669

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 March 31, 2018 for stock options and restricted stock over weighted average periods through March 2022 as follows:

	Stock	Restricted
	Options	Stock
Weighted average period	1.37 years	1.58 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 March 31, 2018:	Options			Price		Fair Value		Value
Outstanding at December 31, 2017		515		$	25.13	$	11.64
Granted		—			—
Exercised		(46	)		12.30		6.84
Forfeited or expired		—			—		—
Outstanding at March 31, 2018		469		$	26.38	$	12.10	$	992
Exercisable at March 31, 2018		302		$	24.10			$	992
Unvested at March 31, 2018		167		$	30.50			$	—

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 March 31, 2018:	Shares			Fair Value
Unvested balance, December 31, 2017		426		$	28.44
Granted		178		$	30.30
Vested		(42	)	$	28.80
Forfeited		(10	)	$	28.39
Unvested balance, March 31, 2018		552		$	29.01

Fair Value of Restricted Stock Awards Vested

The following table indicates the fair value of all restricted stock awards that vested during the three months ended March 31, 2018 and 2017:

	Three		Three
	Months		Months
	Ended		Ended
	March 31,		March 31,
	2018		2017
Fair value of restricted stock awards vested	$	1,256	$	1,277