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Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 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
		March 31,
		2017			2016
Cost of revenue		$	8		$	5
Selling, general and administrative			256			200
Research and development			48			48
Total stock-based compensation			312			253
Tax effect on stock-based compensation			—			—
Net effect on net income		$	312		$	253

Weighted-average assumptions

The fair values of our stock options granted to employees for the three months ended March 31, 2017 and 2016 were estimated using the following weighted-average assumptions:

		Three Months Ended		Three Months Ended
		March 31,		March 31,
		2017		2016
Expected term (in years)		5.9		4.0
Volatility		46.71	%	49.21	%
Expected dividend		—	%	—	%
Risk-free interest rate		2.08	%	1.38	%

Summary of stock option activity

The following table summarizes the stock option transactions during the three months ended March 31, 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		(242)			3.13
Canceled and expired		(14)			2.18
Balance as of March 31, 2017		3,098		$	3.46		7.17		$	7,304
Options vested as of March 31, 2017 and unvested options expected to vest, net of forfeitures		3,032		$	3.44		7.13		$	7,194
Options exercisable as of March 31, 2017		1,609		$	3.40		5.71		$	3,896

Restricted stock awards

A summary of activity related to restricted stock awards for the three months ended March 31, 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		—		$	—
Vested		—		$	—
Forfeited		—		$	—
Non-vested as of  March 31, 2017		325		$	3.27

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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
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-Section 50
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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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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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