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Employee Benefit Plans and Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Employee Benefit Plans and Stock-based Compensation |
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):
|  | Year Ended |
|  | December 31, |
|  | 2016 |  | 2015 |  | 2014 |
Stock‑based compensation in the form of employee stock options and restricted stock, included in: |  |  |  |  |  |  |  |  |  |
Cost of revenue |  | $ | 23 |  | $ | 20 |  | $ | 18 |
Selling, general and administrative |  |  | 908 |  |  | 1,148 |  |  | 938 |
Research and development |  |  | 165 |  |  | 181 |  |  | 173 |
Total stock-based compensation |  |  | 1,096 |  |  | 1,349 |  |  | 1,129 |
Tax effect on stock-based compensation |  |  | — |  |  | — |  |  | — |
Net effect on net income (loss) |  | $ | 1,096 |  | $ | 1,349 |  | $ | 1,129 |
Shares used in computing basic net income per share |  |  | 32,139 |  |  | 32,183 |  |  | 32,452 |
Shares used in computing diluted net income per share |  |  | 32,894 |  |  | 32,183 |  |  | 32,452 |
Effect on basic net income per share |  | $ | (0.03) |  | $ | (0.04) |  | $ | (0.03) |
Effect on diluted net income per share |  | $ | (0.03) |  | $ | (0.04) |  | $ | (0.03) |
Weighted-average assumptions |
|  | Year Ended |
|  | December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Expected term (in years) |  | 4.0 |  |  | 3.9 |  |  | 4.1 |
Volatility |  | 46.5 | % |  | 51.1 | % |  | 63.2 | %
Expected dividend |  | — | % |  | — | % |  | — | %
Risk-free interest rate |  | 1.47 | % |  | 1.75 | % |  | 1.85 | %
Summary of stock option activity | The following table summarizes the stock option transactions for each of the years ended December 31, 2014, 2015 and 2016 (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, 2014 |  | 2,671 |  |  | 3.29 |  | 6.71 |  | $ | 893 |
Granted |  | 712 |  |  | 2.40 |  |  |  |  |  |
Exercised |  | (111) |  |  | 1.21 |  |  |  |  |  |
Canceled and expired |  | (74) |  |  | 5.18 |  |  |  |  |  |
Balance as of December 31, 2014 |  | 3,198 |  |  | 3.12 |  | 6.95 |  | $ | 1,247 |
Granted |  | 866 |  |  | 2.19 |  |  |  |  |  |
Exercised |  | (119) |  |  | 1.38 |  |  |  |  |  |
Canceled and expired |  | (166) |  |  | 3.03 |  |  |  |  |  |
Balance as of December 31, 2015 |  | 3,779 |  | $ | 2.97 |  | 6.26 |  | $ | 764 |
Granted |  | 624 |  |  | 4.92 |  |  |  |  |  |
Exercised |  | (555) |  |  | 2.41 |  |  |  |  |  |
Canceled and expired |  | (554) |  |  | 3.26 |  |  |  |  |  |
Balance as of December 31, 2016 |  | 3,294 |  | $ | 3.38 |  | 7.23 |  | $ | 5,301 |
Options vested as of December 31, 2016 and unvested options expected to vest, net of forfeitures |  | 3,228 |  | $ | 3.37 |  | 7.18 |  | $ | 5,226 |
Options exercisable as of December 31, 2016 |  | 1,718 |  | $ | 3.45 |  | 5.70 |  | $ | 2,732 |
Options outstanding and exercisable | The options outstanding and exercisable as of December 31, 2016 were in the following exercise price ranges (in thousands, except per share data):
|  |  |  |  |  |  |  |  |  |  |  |  | Options Vested and |
|  |  |  |  |  | Options Outstanding as of |  | Exercisable as of |
|  |  |  |  |  | December 31, 2016 |  | December 31, 2016 |
|  |  |  |  |  |  |  |  |  |  | Weighted‑average |  |  |  |  |  |
Range of |  |  |  | Weighted‑average |  | Remaining |  |  |  | Weighted‑Average |
Exercise Price |  | Shares |  | Exercise Price |  | Contractual Life |  | Shares |  | Exercise Price |
$ | 1.59 | - | $ | 2.14 |  | 192 |  | $ | 1.80 |  | 3.52 |  | 174 |  | $ | 1.76 |
$ | 2.18 | - | $ | 2.18 |  | 785 |  | $ | 2.18 |  | 8.84 |  | 190 |  | $ | 2.18 |
$ | 2.29 | - | $ | 2.36 |  | 484 |  | $ | 2.33 |  | 7.09 |  | 329 |  | $ | 2.33 |
$ | 2.47 | - | $ | 2.51 |  | 346 |  | $ | 2.47 |  | 7.87 |  | 162 |  | $ | 2.47 |
$ | 2.56 | - | $ | 2.91 |  | 340 |  | $ | 2.84 |  | 6.48 |  | 272 |  | $ | 2.91 |
$ | 4.79 | - | $ | 4.92 |  | 220 |  | $ | 4.80 |  | 4.61 |  | 220 |  | $ | 4.80 |
$ | 5.21 | - | $ | 5.21 |  | 556 |  | $ | 5.21 |  | 9.83 |  | — |  | $ | — |
$ | 5.61 | - | $ | 5.83 |  | 321 |  | $ | 5.78 |  | 3.98 |  | 321 |  | $ | 5.78 |
$ | 6.31 | - | $ | 6.31 |  | 39 |  | $ | 6.31 |  | 0.81 |  | 39 |  | $ | 6.31 |
$ | 7.82 | - | $ | 7.82 |  | 11 |  | $ | 7.82 |  | 3.84 |  | 11 |  | $ | 7.82 |
|  |  |  |  |  | 3,294 |  | $ | 3.38 |  | 7.23 |  | 1,718 |  | $ | $ 3.45 |
Restricted stock awards |
|  |  |  | Weighted-Average |
|  |  |  | Grant Date |
Stock Awards |  | Shares |  | Fair Value |
Non-vested as of January 1, 2014 |  | 241 |  | $ | 3.44 |
Granted |  | 121 |  | $ | 2.34 |
Vested |  | (101) |  | $ | 4.01 |
Forfeited |  | — |  | $ | — |
Non-vested as of December 31, 2014 |  | 261 |  | $ | 2.71 |
Granted |  | 547 |  | $ | 2.42 |
Vested |  | (215) |  | $ | 2.81 |
Forfeited |  | (47) |  |  | 2.47 |
Non-vested as of December 31, 2015 |  | 546 |  | $ | 2.39 |
Granted |  | 136 |  | $ | 4.66 |
Vested |  | (150) |  | $ | 2.34 |
Forfeited |  | (207) |  | $ | 2.55 |
Non-vested as of December 31, 2016 |  | 325 |  | $ | 3.27 |
Common stock reserved for future issuance | The following number of shares of common stock were reserved and available for future issuance at December 31, 2016 (in thousands, except per share data):
Options outstanding |  | 3,294 |
Restricted stock awards outstanding |  | 325 |
Stock available for future grant: 2015 Equity Incentive Plan |  | 2,785 |
Total |  | 6,404 |

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