Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2016

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,
	2016			2015
Dividend yield		0	%		0	%
Expected life	3.4 years			3.3 years
Expected volatility		55	%		52	%
Risk-free interest rate		1.1	%		1.2	%

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,
	2016		2015
Cost of revenue— professional engineering service	$	220	$	508
Selling, general and administrative		868		925
Research and development		159		83
Total stock-based compensation expense	$	1,247	$	1,516
Per basic and diluted share	$	0.10	$	0.12

Summary of Stock Option Activity

The following table summarizes stock option activity under the Plans for 2016 and 2015:

						Weighted
						Average
				Weighted		Remaining
				Average		Contractual		Aggregate
	Number of			Exercise		Life		Intrinsic
Stock Options	Shares			Price		(in years)		Value
Balance at January 1, 2015		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
Granted		903,248			5.24
Exercised		(371,845	)		3.17
Forfeited		(396,161	)		5.32
Expired		(67,171	)		5.91
Balance at December 31, 2016		1,846,768		$	4.84		8.19	$	2,138,361
Vested and expected to vest at December 31, 2016		1,676,601		$	4.79		8.05	$	2,036,356
Exercisable at December 31, 2016		771,265		$	4.15		6.63	$	1,425,867

Summary of Certain Information about Stock Options

The following table summarizes certain information about stock options:

	Year Ended
	December 31,
	2016		2015
Weighted average grant-date fair value for options granted    during the year	$	2.63	$	3.13
Vested options in-the-money at December 31		605,017		703,765
Aggregate intrinsic value of options exercised during the year	$	773,327	$	860,743

Summary of Restricted Stock Unit Activity

The following table summarizes restricted stock unit activity under the Stock Plan for 2016 and 2015:

				Weighted
				Average
	Number of			Award
	Shares			Price
Unvested at January 1, 2015		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
Granted		107,370			5.41
Vested		(76,258	)		5.81
Forfeited		(15,969	)		5.77
Unvested at December 31, 2016		119,606		$	5.60
Expected to vest after December 31, 2016		102,834		$	5.62

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,
	2016		2015
Stock options outstanding		1,846,768		1,778,697
Restricted stock units outstanding		119,606		104,463
Stock options available for future grant		689,160		1,020,477
Common stock reserved for future issuance		2,655,534		2,903,637