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Employee Benefit Plans and Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Employee Benefit Plans and Stock-based Compensation [Abstract]

Summary of stock option activity

The following summarizes our stock option activity under the 2007 Plan, and the related weighted average exercise price within each category for each of the years ended December 31, 2010, 2011, and 2012 (in thousands, except per share data):

Stock Options	Number of Options Outstanding	Weighted- average Exercise Price	Weighted- average Remaining Contractual Life	Aggregate Intrinsic Value
			(in years)
Balance as of January 1, 2010	2,880	2.46	5.70	$  3,850
Granted	399	5.93
Exercised	(876)	1.71
Canceled and expired	(123)	7.26
Balance as of December 31, 2010	2,280	3.10	6.40	$17,030
Granted	367	4.79
Exercised	(251)	2.54
Canceled and expired	(16)	27.98
Balance as of December 31, 2011	2,380	3.25	6.25	$  3,456
Granted	592	3.32
Exercised	(136)	2.17
Canceled and expired	(109)	4.25
Balance as of December 31, 2012	2,727	$3.28	6.71	$  1,353
Options vested and expected to vest as of December 31, 2012	2,717	$3.28	6.70	$  1,352
Options exercisable as of December 31, 2012	1,595	$2.88	5.16	$  1,235

Options outstanding and exercisable

The options outstanding and exercisable as of December 31, 2012 were in the following exercise price ranges (in thousands, except per share data):

		Options Outstanding as of December 31, 2012			Options Vested and Exercisable as of December 31, 2012
Range of Exercise Price		Shares	Weighted-average Exercise Price	Weighted-average Remaining Contractual Life	Shares	Weighted-Average Exercise Price
$1.18 - $1.38		403	$1.31	1.49	403	$1.31
$1.40 - $1.40		1	$1.40	2.20	1	$1.40
$1.59 - $1.59		328	$1.59	6.29	294	$1.59
$1.88 - $1.91		8	$1.90	1.74	8	$1.90
$2.04 - $2.04		442	$2.04	6.82	343	$2.04
$2.91 - $2.91		488	$2.91	9.85	0	$0.00
$3.11 - $4.09		91	$3.37	3.48	67	$3.17
$4.79 - $4.79		366	$4.79	8.82	107	$4.79
$4.81 - $5.61		145	$5.26	6.85	65	$4.84
$5.83 - $7.82		455	$6.00	7.16	307	$6.01
		2,727	$3.28	6.71	1,595	$2.88

Restricted stock awards

A summary of activity related to restricted stock awards for the years ended December 31, 2010, 2011 and 2012 is presented below:

Stock Awards	Shares	Weighted-Average Grant Date Fair Value
Non-vested as of January 1, 2010	170,660	$ 1.21
Granted	121,237	5.29
Vested	(69,092)	1.48
Forfeited	(4,400)	5.83
Non-vested as of December 31, 2010	218,405	3.30
Granted	97,986	5.21
Vested	(93,264)	2.51
Non-vested as of December 31, 2011	223,127	4.47
Granted	113,768	3.18
Vested	(98,172)	3.42
Non-vested as of December 31, 2012	238,723	$ 4.27

Compensation costs related to stock-based awards

We recorded $1.2 million, $896,000 and $655,000 of stock-based compensation in our consolidated statements of operations for the years ended December 31, 2012, 2011 and 2010, respectively. The following table summarizes compensation costs related to our stock-based compensation awards (in thousands, except per share data):

	Years Ended December 31,
	2012	2011	2010
Stock-based compensation in the form of employee stock options and restricted stock, included in:
Cost of revenue	$       78	$       84	$        36
Selling, general and administrative	1,000	766	562
Research and development	137	46	57
Total stock-based compensation	1,215	896	655
Tax effect on stock-based compensation	—	—	—
Net effect on net income	$  1,215	$     896	$655
Shares used in computing basic net income per share	32,144	31,872	31,008
Shares used in computing diluted net income per share	32,865	33,061	32,512
Effect on basic net income per share	$ (0.04)	$ (0.03)	$  (0.02)
Effect on diluted net income per share	$ (0.04)	$ (0.03)	$  (0.02)

Weighted-average assumptions

We estimate the fair value of stock options using a Black-Scholes valuation model. There were 592,000, 367,000 and 399,000 stock options granted with weighted-average grant date fair value of $1.79, $2.65 and $3.11 per share during 2012, 2011 and 2010, respectively. The fair value of options granted was estimated at the date of grant using the following weighted-average assumptions:

	Years Ended December 31,
	2012	2011	2010
Expected term (in years)	4.0	4.0	4.0
Volatility	72.87%	69.84%	69.0%
Expected dividend	0%	0%	0%
Risk-free interest rate	0.57%	1.00%	2.04%

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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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