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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Stock-Based Compensation

Summary of compensation costs related to stock-based awards

The following table summarizes compensation costs related to our stock-based awards (in thousands, except per share data):

		Three Months Ended						Six Months Ended
		June 30,						June 30,
		2019			2018			2019			2018
Cost of revenue		$	30		$	21		$	61		$	42
Selling, general and administrative			426			368			863			737
Research and development			112			75			202			152
Total stock-based compensation			568			464			1,126			931
Tax effect on stock-based compensation			—			—			—			—
Net effect on net income		$	568		$	464		$	1,126		$	931

Summary of stock option activity

The following table summarizes the stock option transactions during the six months ended June 30, 2019 (in thousands, except per share data):

							Weighted
							average
				Weighted-			Remaining
		Number of		average			Contractual		Aggregate
		Options		Exercise			Life		Intrinsic
Stock Options		Outstanding		Price			(in years)		Value
Balance as of January 1, 2019		2,654		$	4.09		6.28		$	2,720
Granted		—			—
Exercised		(98)			2.38
Canceled and expired		(13)			4.25
Balance as of June 30, 2019		2,543		$	4.15		5.78		$	2,022
Options vested as of June 30, 2019 and unvested options expected to vest, net of forfeitures		2,525		$	4.14		5.76		$	2,022
Options exercisable as of June 30, 2019		1,949		$	3.70		5.05		$	1,875

Summary of restricted stock awards activity

A summary of activity related to restricted stock awards for the six months ended June 30, 2019 is presented below (in thousands, except per share data):

				Weighted-Average
				Grant Date
Stock Awards		Shares		Fair Value
Non-vested as of January 1, 2019		633		$	6.85
Granted		142		$	5.14
Vested		(57)		$	8.54
Forfeited		(19)		$	7.16
Non-vested as of June 30, 2019		699		$	6.35

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Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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