Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2016			2015
Dividend yield		0	%		0	%
Expected life	3.4 years			3.3 years
Expected volatility		55	%		53	%
Risk-free interest rate		1.1	%		1.2	%

Stock-Based Compensation Expense

The impact on our results of operations of stock-based compensation expense for the three month periods ended March 31, 2016 and 2015 was as follows (in thousands, except per share amounts):

	Three Months Ended March 31,
	2016		2015
Cost of revenue — service	$	138	$	113
Selling, general and administrative		249		138
Research and development		26		13
Total stock-based compensation expense	$	413	$	264
Per diluted share	$	0.03	$	0.02

Summary of Stock Option Activity

The following table summarizes stock option activity under the Plans for the three month period ended March 31, 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		168,775			5.82
Exercised		(19,081	)		3.14
Forfeited		(15,843	)		5.79
Expired		(390	)		4.30
Balance at March 31, 2016		1,912,158		$	4.56		7.79	$	2,918,097
Vested and expected to vest at March 31, 2016		1,776,293		$	4.47		7.68	$	2,845,908
Exercisable at March 31, 2016		838,549		$	3.62		6.23	$	1,964,768

Summary of Certain Information about Stock Options

The following table summarizes certain information about stock options:

	Three Months Ended March 31,
	2016		2015
Weighted-average grant-date fair value of option    grants for the period	$	3.06	$	2.34
Options in-the-money at period end		1,338,733		1,353,633
Aggregate intrinsic value of options exercised	$	49,330	$	47,880

Summary of Restricted Stock Unit Activity

The following table summarizes RSU activity for the three month period ended March 31, 2016:

	Number of Shares			Weighted Average Grant Date Fair Value
Unvested at January 1, 2016		104,463		$	5.97
Granted		2,500			5.83
Vested		(13,408	)		6.19
Forfeited		—			—
Unvested at March 31, 2016		93,555		$	5.94
Expected to vest after March 31, 2016		83,054		$	5.91

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 March 31, 2016:

Stock options outstanding	1,912,158
RSUs outstanding	93,555
Stock awards available for future grant	865,435
Common stock reserved for future issuance	2,871,148