Shareholders' Equity (Tables)

6 Months Ended

Jun. 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 June 30,						Six Months Ended June 30,
	2016			2015			2016			2015
Dividend yield		0	%		0	%		0	%		0	%
Expected life	3.4 years			3.3 years			3.4 years			3.3 years
Expected volatility		55	%		52	%		55	%		52	%
Risk-free interest rate		1.1	%		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 June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Cost of revenue — service	$	36	$	105	$	173	$	218
Selling, general and administrative		150		182		357		320
Research and development		29		18		98		31
Total stock-based compensation expense	$	215	$	305	$	628	$	569
Per diluted share	$	0.02	$	0.02	$	0.05	$	0.05

Summary of Stock Option Activity

The following table summarizes stock option activity under the Plans for the six-month period ended June 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		176,075			5.80
Exercised		(124,176	)		2.86
Forfeited		(313,148	)		5.22
Expired		(878	)		5.23
Balance at June 30, 2016		1,516,570		$	4.56		6.71	$	2,028,252
Vested and expected to vest at June 30, 2016		1,445,567		$	4.50		6.61	$	1,999,111
Exercisable at June 30, 2016		806,776		$	3.73		4.95	$	1,558,756

Summary of Certain Information about Stock Options

The following table summarizes certain information about stock options:

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Weighted-average grant-date fair value of option    grants for the period	$	2.87	$	1.88	$	3.05	$	1.92
Options in-the-money at period end		948,745		1,390,199		948,745		1,390,199
Aggregate intrinsic value of options exercised	$	310,756	$	302,895	$	360,086	$	350,776

Summary of Restricted Stock Unit Activity

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

	Number of Shares			Weighted Average Grant Date Fair Value
Unvested at January 1, 2016		104,463		$	5.97
Granted		41,429			5.78
Vested		(29,147	)		6.11
Forfeited		(15,969	)		5.77
Unvested at June 30, 2016		100,776		$	5.89
Expected to vest after June 30, 2016		91,667		$	5.87

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 June 30, 2016:

Stock options outstanding	1,516,570
RSUs outstanding	100,776
Stock awards available for future grant	1,132,968
Common stock reserved for future issuance	2,750,314