Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2015

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,
	2015			2014			2015			2014
Dividend yield		0	%		0	%		0	%		0	%
Expected life	3.3 years			3.3 years			3.3 years			3.3 years
Expected volatility		53	%		57	%		52	%		59	%
Risk-free interest rate		1.3	%		1.4	%		1.2	%		1.3	%

Stock-Based Compensation Expense

The impact on our results of operations of stock-based compensation expense for the three and nine month periods ended September 30, 2015 and 2014 was as follows (in thousands, except per share amounts):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
Cost of revenue — service	$	133	$	69	$	351	$	146
Selling, general and administrative		298		144		616		510
Research and development		23		15		55		35
Total stock-based compensation expense	$	454	$	228	$	1,022	$	691
Per diluted share	$	0.04	$	0.02	$	0.08	$	0.06

Summary of Stock Option Activity

The following table summarizes stock option activity under the Plans for the nine month period ended September 30, 2015:

Stock Options	Number of Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value
Balance at January 1, 2015		1,553,360		$	3.50
Granted		556,350			6.33
Exercised		(187,350	)		2.99
Forfeited		(63,941	)		3.52
Expired		(7,001	)		2.66
Balance at September 30, 2015		1,851,418		$	4.40		7.66	$	4,131,502
Vested and expected to vest at September 30, 2015		1,702,830		$	4.32		7.51	$	3,945,697
Exercisable at September 30, 2015		714,893		$	3.62		5.53	$	2,155,288

Summary of Certain Information about Stock Options

The following table summarizes certain information about stock options for the three and nine month periods ended September 30, 2015 and 2014:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
Weighted-average grant-date fair value of option    grants for the period	$	3.16	$	1.74	$	3.10	$	1.71
Options in-the-money at period end		1,762,893		425,877		1,762,893		425,877
Aggregate intrinsic value of options exercised	$	265,641	$	171,558	$	616,417	$	412,781

Summary of Restricted Stock Unit Activity

The following table summarizes RSU activity for the nine month period ended September 30, 2015:

	Number of Shares			Weighted Average Grant Date Fair Value
Unvested at December 31, 2014		80,179		$	3.40
Granted		117,049			6.34
Vested		(63,614	)		3.92
Forfeited		(8,976	)		3.15
Unvested at September 30, 2015		124,638		$	5.91
Expected to vest after September 30, 2015		109,695		$	5.89

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, 2015:

Stock options outstanding	1,851,418
RSUs outstanding	124,638
Stock awards available for future grant	1,010,602
Common stock reserved for future issuance	2,986,658