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Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

Stock-based Compensation

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						Nine Months Ended
		September 30,						September 30,
		2017			2016			2017			2016
Cost of revenue		$	7		$	5		$	22		$	15
Selling, general and administrative			280			238			788			651
Research and development			52			38			151			123
Total stock-based compensation			339			281			961			789
Tax effect on stock-based compensation			—			—			—			—
Net effect on net income		$	339		$	281		$	961		$	789

Weighted-average assumptions

		Three Months Ended		Nine Months Ended
		September 30,		September 30,
		2017		2017
Expected term (in years)		—		5.9
Volatility		—	%	46.71	%
Expected dividend		—	%	—	%
Risk-free interest rate		—	%	2.08	%

Summary of stock option activity

The following table summarizes the stock option transactions during the nine months ended September 30, 2017 (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, 2017		3,294		$	3.38		7.23		$	5,301
Granted		60			5.95
Exercised		(481)			3.17
Canceled and expired		(24)			3.31
Balance as of September 30, 2017		2,849		$	3.47		6.98		$	16,173
Options vested as of September 30, 2017 and unvested options expected to vest, net of forfeitures		2,806		$	3.46		6.95		$	15,964
Options exercisable as of September 30, 2017		1,591		$	3.26		5.83		$	9,366

Restricted stock awards

A summary of activity related to restricted stock awards for the nine months ended September 30, 2017 is presented below (in thousands, except per share data):

				Weighted-Average
				Grant Date
Stock Awards		Shares		Fair Value
Non-vested as of January 1, 2017		325		$	3.27
Granted		71		$	7.96
Vested		(74)		$	3.22
Forfeited		—		$	—
Non-vested as of  September 30, 2017		322		$	4.32

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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 of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

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-Publisher FASB
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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