Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Fair Values of Equity Awards, Primarily Stock Option Grants Estimated with Weighted Average Assumptions

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

	Year Ended
	December 31,
	2015			2014
Dividend yield		0	%		0	%
Expected life	3.3 years			3.3 years
Expected volatility		52	%		59	%
Risk-free interest rate		1.2	%		1.3	%

Stock-Based Compensation Expense

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

	Year Ended
	December 31,
	2015		2014
Cost of revenue—service	$	508	$	236
Selling, general and administrative		925		698
Research and development		83		48
Total stock-based compensation expense	$	1,516	$	982
Per basic and diluted share	$	0.12	$	0.08

Summary of Stock Option Activity

The following table summarizes stock option activity under the Plans for 2015 and 2014:

						Weighted
						Average
				Weighted		Remaining
				Average		Contractual		Aggregate
	Number of			Exercise		Life		Intrinsic
Stock Options	Shares			Price		(in years)		Value
Balance at January 1, 2014		1,515,621		$	3.36		3.93
Granted		848,208			3.53
Exercised		(393,128	)		2.50
Forfeited		(122,280	)		3.28
Expired		(295,061	)		4.34
Balance at December 31, 2014		1,553,360		$	3.50		7.04
Granted		564,450			6.37
Exercised		(250,196	)		3.18
Forfeited		(81,666	)		4.01
Expired		(7,251	)		2.82
Balance at December 31, 2015		1,778,697		$	4.43		7.83	$	3,166,290
Vested and expected to vest at December 31, 2015		1,656,034		$	4.35		7.72	$	3,065,335
Exercisable at December 31, 2015		762,555		$	3.61		6.28	$	1,911,371

Summary of Certain Information about Stock Options

The following table summarizes certain information about stock options:

	Year Ended
	December 31,
	2015		2014
Weighted average grant-date fair value for options granted    during the year	$	3.13	$	1.73
Vested options in-the-money at December 31		703,765		443,309
Aggregate intrinsic value of options exercised during the year	$	860,743	$	436,770

Summary of Restricted Stock Unit Activity

The following table summarizes restricted stock unit activity under the Stock Plan for 2015 and 2014:

				Weighted
				Average
	Number of			Award
	Shares			Price
Unvested at January 1, 2014		187,382		$	4.40
Granted		110,235			3.21
Vested		(159,565	)		3.68
Forfeited		(57,873	)		5.51
Unvested at December 31, 2014		80,179		$	3.40
Granted		117,049			6.34
Vested		(83,789	)		4.32
Forfeited		(8,976	)		3.15
Unvested at December 31, 2015		104,463		$	5.97
Expected to vest after December 31, 2015		92,303		$	5.95

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:

	December 31,
	2015		2014
Stock options outstanding		1,778,697		1,553,360
Restricted stock units outstanding		104,463		80,179
Stock options available for future grant		1,020,477		654,083
Common stock reserved for future issuance		2,903,637		2,287,622