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Employee Benefit Plans and Stock-based Compensation (Tables) | 12 Months Ended
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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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