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Employee Benefit Plans and Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2013
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, 2011, 2012, and 2013 (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, 2011 |  |  | 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 |
Granted |  |  | 488 |  |  |  | 2.38 |  |  |  |  |  |  |  |  |
Exercised |  |  | (331 | ) |  |  | 1.62 |  |  |  |  |  |  |  |  |
Canceled and expired |  |  | (213 | ) |  |  | 3.60 |  |  |  |  |  |  |  |  |
Balance as of December 31, 2013 |  |  | 2,671 |  |  | $ | 3.29 |  |  |  | 6.71 |  |  | $ | 893 |
Options vested and expected to vest as of December 31, 2013 |  |  | 2,649 |  |  | $ | 3.30 |  |  |  | 6.68 |  |  | $ | 889 |
Options exercisable as of December 31, 2013 |  |  | 1,666 |  |  | $ | 3.34 |  |  |  | 5.33 |  |  | $ | 786 |
Options outstanding and exercisable | The options outstanding and exercisable as of December 31, 2013 were in the following exercise price ranges (in thousands, except per share data):
|  | Options Outstanding as of December 31, 2013 |  |  | Options Vested and Exercisable as of December 31, 2013 |
Range of Exercise Price |  | Shares |  |  | Weighted‑average Exercise Price |  |  | Weighted‑average Remaining Contractual Life |  |  | Shares |  |  | Weighted‑Average Exercise Price |
$1.18 ‑ $1.34 |  |  | 216 |  |  | $ | 1.26 |  |  |  | 1.17 |  |  |  | 216 |  |  | $ | 1.26 |
$1.59 ‑ $1.59 |  |  | 296 |  |  | $ | 1.59 |  |  |  | 5.34 |  |  |  | 296 |  |  | $ | 1.59 |
$1.91 ‑ $1.91 |  |  | 4 |  |  | $ | 1.91 |  |  |  | 1.87 |  |  |  | 4 |  |  | $ | 1.91 |
$2.04 ‑ $2.04 |  |  | 333 |  |  | $ | 2.04 |  |  |  | 5.82 |  |  |  | 333 |  |  | $ | 2.04 |
$2.36 ‑ $2.36 |  |  | 428 |  |  | $ | 2.36 |  |  |  | 9.84 |  |  |  | 0 |  |  | $ | 0.00 |
$2.91 ‑ $2.91 |  |  | 444 |  |  | $ | 2.91 |  |  |  | 8.85 |  |  |  | 120 |  |  | $ | 2.91 |
$3.14 ‑ $4.09 |  |  | 42 |  |  | $ | 3.66 |  |  |  | 5.06 |  |  |  | 28 |  |  | $ | 3.53 |
$4.79 ‑ $4.79 |  |  | 341 |  |  | $ | 4.79 |  |  |  | 7.59 |  |  |  | 189 |  |  | $ | 4.79 |
$4.81 ‑ $5.61 |  |  | 142 |  |  | $ | 5.27 |  |  |  | 5.69 |  |  |  | 97 |  |  | $ | 5.11 |
$5.83 ‑ $7.82 |  |  | 425 |  |  | $ | 5.96 |  |  |  | 5.61 |  |  |  | 383 |  |  | $ | 5.96 |
|  |  | 2,671 |  |  | $ | 3.29 |  |  |  | 6.71 |  |  |  | 1,666 |  |  | $ | 3.34
Restricted stock awards | A summary of activity related to restricted stock awards for the years ended December 31, 2011, 2012 and 2013 is presented below:
Stock Awards |  | Shares |  |  | Weighted‑Average Grant Date Fair Value |
Non-vested as of January 1, 2011 |  |  | 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 |
Granted |  |  | 103,636 |  |  | $ | 2.52 |
Vested |  |  | (85,127 | ) |  | $ | 4.56 |
Forfeited |  |  | (16,000 | ) |  | $ | 4.03 |
Non-vested as of December 31, 2013 |  |  | 241,232 |  |  | $ | 3.44 |
Common stock reserved for future issuance | The following number of shares of common stock were reserved and available for future issuance at December 31, 2013:
Options outstanding |  |  | 2,670,528 |
Restricted stock awards outstanding |  |  | 241,232 |
Stock available for future grant: 2007 Equity Incentive Plan |  |  | 1,785,504 |
Total |  |  | 4,697,264 |
Compensation costs related to stock-based awards | The following table summarizes compensation costs related to our stock‑based compensation awards (in thousands, except per share data):
|  | Years Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Stock‑based compensation in the form of employee stock options and restricted stock, included in: |  |  |  |  |  |  |  |  |
Cost of revenue |  | $ | 22 |  |  | $ | 78 |  |  | $ | 84 |
Selling, general and administrative |  |  | 1,091 |  |  |  | 1,000 |  |  |  | 766 |
Research and development |  |  | 164 |  |  |  | 137 |  |  |  | 46 |
Total stock‑based compensation |  |  | 1,277 |  |  |  | 1,215 |  |  |  | 896 |
Tax effect on stock‑based compensation |  |  | — |  |  |  | — |  |  |  | — |
Net effect on net income |  | $ | 1,277 |  |  | $ | 1,215 |  |  | $ | 896 |
Shares used in computing basic net income per share |  |  | 32,700 |  |  |  | 32,144 |  |  |  | 31,872 |
Shares used in computing diluted net income per share |  |  | 32,700 |  |  |  | 32,865 |  |  |  | 33,061 |
Effect on basic net income per share |  | $ | (0.04 | ) |  | $ | (0.04 | ) |  | $ | (0.03 | )
Effect on diluted net income per share |  | $ | (0.04 | ) |  | $ | (0.04 | ) |  | $ | (0.03 | )
Weighted-average assumptions | The fair value of options granted was estimated at the date of grant using the following weighted‑average assumptions:
|  | Years Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Expected term (in years) |  |  | 4.0 |  |  |  | 4.0 |  |  |  | 4.0 |
Volatility |  |  | 59.20 | % |  |  | 72.87 | % |  |  | 69.84 | %
Expected dividend |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Risk-free interest rate |  |  | 0.98 | % |  |  | 0.57 | % |  |  | 1.00 | %

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