Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Fair Values of Stock Option Grants Estimated with Weighted Average Assumptions

The fair values of our stock option grants were estimated with the following weighted average assumptions:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Dividend yield		0	%		0	%		0	%		0	%
Expected life	3.3 years			3.3 years			3.4 years			3.3 years
Expected volatility		55	%		53	%		55	%		52	%
Risk-free interest rate		1.0	%		1.3	%		1.1	%		1.2	%

Stock-Based Compensation Expense

The impact on our results of operations from stock-based compensation expense was as follows (in thousands, except per share amounts):

	Three Months Ended September 30,					Nine Months Ended September 30,
	2016			2015		2016		2015
Cost of revenue — service	$	(4	)	$	133	$	169	$	351
Selling, general and administrative		262			298		618		616
Research and development		22			23		121		55
Total stock-based compensation expense	$	280		$	454	$	908	$	1,022
Per diluted share	$	0.02		$	0.04	$	0.07	$	0.08

Summary of Stock Option Activity

The following table summarizes stock option activity under the Plans for the nine-month period ended September 30, 2016:

Stock Options	Number of Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value
Balance at January 1, 2016		1,778,697		$	4.43
Granted		307,700			5.48
Exercised		(273,320	)		3.19
Forfeited		(380,472	)		5.31
Expired		(51,367	)		6.13
Balance at September 30, 2016		1,381,238		$	4.61		7.31	$	1,176,876
Vested and expected to vest at September 30, 2016		1,305,619		$	4.55		7.21	$	1,165,259
Exercisable at September 30, 2016		773,084		$	4.02		6.24	$	948,542

Summary of Certain Information about Stock Options

The following table summarizes certain information about stock options:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Weighted-average grant-date fair value of option    grants for the period	$	2.53	$	3.16	$	2.83	$	3.10
Options in-the-money at period end		766,101		1,762,893		766,101		1,762,893
Aggregate intrinsic value of options exercised	$	226,430	$	265,641	$	568,516	$	616,417

Summary of Restricted Stock Unit Activity

The following table summarizes RSU activity for the nine-month period ended September 30, 2016:

	Number of Shares			Weighted Average Grant Date Fair Value
Unvested at January 1, 2016		104,463		$	5.97
Granted		54,870			5.65
Vested		(56,081	)		5.94
Forfeited		(15,969	)		5.77
Unvested at September 30, 2016		87,283		$	5.83
Expected to vest after September 30, 2016		78,781		$	5.81

Summary of Shares of Common Stock Reserved for Future Issuance under Plans

The following table summarizes our shares of common stock reserved for future issuance under the Plans as of September 30, 2016:

Stock options outstanding	1,381,238
RSUs outstanding	87,283
Stock awards available for future grant	1,105,715
Common stock reserved for future issuance	2,574,236