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Equity Incentive Plan (Tables) | 12 Months Ended
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Dec. 31, 2015
Summary of Plan Includes Stock Options and Restricted Stock Units | The following is a summary of, the 2005 Plan and the 2015 Plan, which includes stock options and restricted stock units:
|  | Unit (in Thousands) |
Available for grant at January 1, 2013 |  |  | 5,336 |
Restricted stock units granted |  |  | (1,893 | )
Option and restricted stock units forfeited |  |  | 123 |
Available for grant at December 31, 2013 |  |  | 3,566 |
Restricted stock units granted |  |  | (1,923 | )
Option and restricted stock units forfeited |  |  | 44 |
Available for grant at December 31, 2014 |  |  | 1,687 |
Authorized |  |  | 20,000 |
Restricted stock units granted |  |  | (2,000 | )
Option and restricted stock units forfeited |  |  | 175 |
Available for grant at December 31, 2015 |  |  | 19,862 |
Summary of Stock Option Activity | A summary of the stock option activity and related information is as follows:
|  | Number of Options Shares (in Thousands) |  |  | Weighted Average Exercise Price (US$) |  |  | Weighted Average Remaining Contractual Life (Years) |
Outstanding at January 1, 2013 |  |  | 1,697 |  |  |  | 1.47 |  |  |  |  |
Options forfeited |  |  | — |  |  |  | — |  |  |  |  |
Options exercised |  |  | (287 | ) |  |  | 1.47 |  |  |  |  |
Outstanding at December 31, 2013 |  |  | 1,410 |  |  |  | 1.47 |  |  |  | 2.14 |
Options vested and expected to vest after December 31, 2013 |  |  | 1,410 |  |  |  | 1.47 |  |  |  | 2.14 |
Options forfeited |  |  | — |  |  |  | — |  |  |  |  |
Options exercised |  |  | (352 | ) |  |  | 1.46 |  |  |  |  |
Outstanding at December 31, 2014 |  |  | 1,058 |  |  |  | 1.47 |  |  |  | 1.35 |
Options vested and expected to vest after December 31, 2014 |  |  | 1,058 |  |  |  | 1.47 |  |  |  | 1.35 |
Options forfeited |  |  | (143 | ) |  |  | 1.47 |  |  |  |  |
Options exercised |  |  | (336 | ) |  |  | 1.47 |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 579 |  |  |  | 1.47 |  |  |  | 0.92 |
Options vested and expected to vest after December 31, 2015 |  |  | 579 |  |  |  | 1.47 |  |  |  | 0.92 |
Options exercisable at December 31, 2015 |  |  | 579 |  |  |  | 1.47 |  |  |  | 0.92 |
Summary of Restricted Stock Units and Changes | A summary of the status of restricted stock units and changes is as follows:
|  | Number of Non-vested Stock Units (in Thousands) |  |  | Weighted Average Grant Date Fair Value (US$) |  |  | Weight Average Remaining Recognition Period (Years) |
Non-vested at January 1, 2013 |  |  | 7,018 |  |  |  | 2.68 |  |  |  |  |
Restricted stock units granted |  |  | 1,893 |  |  |  | 3.13 |  |  |  |  |
Restricted stock units vested |  |  | (4,867 | ) |  |  | 2.60 |  |  |  |  |
Restricted stock units forfeited |  |  | (123 | ) |  |  | 2.60 |  |  |  |  |
Non-vested at December 31, 2013 |  |  | 3,921 |  |  |  | 2.90 |  |  |  | 0.43 |
Restricted stock units granted |  |  | 1,923 |  |  |  | 5.13 |  |  |  |  |
Restricted stock units vested |  |  | (3,640 | ) |  |  | 2.96 |  |  |  |  |
Restricted stock units forfeited |  |  | (44 | ) |  |  | 4.92 |  |  |  |  |
Non-vested at December 31, 2014 |  |  | 2,160 |  |  |  | 4.90 |  |  |  | 0.31 |
Restricted stock units granted |  |  | 2,000 |  |  |  | 6.83 |  |  |  |  |
Restricted stock units vested |  |  | (2,003 | ) |  |  | 4.96 |  |  |  |  |
Restricted stock units forfeited |  |  | (32 | ) |  |  | 5.85 |  |  |  |  |
Non-vested at December 31, 2015 |  |  | 2,125 |  |  |  | 6.65 |  |  |  | 0.73 |
Stock-based Compensation Expense | The following table shows total stock-based compensation expense included in the Consolidated Statements of Income for the years ended December 31, 2013, 2014 and 2015.
|  | Year Ended December 31 |
|  | 2013 |  |  | 2014 |  |  | 2015 |
|  | US$ |  |  | US$ |  |  | US$ |
Cost of sales |  |  | 308 |  |  |  | 282 |  |  |  | 261 |
Research and development |  |  | 6,351 |  |  |  | 6,773 |  |  |  | 6,565 |
Sales and marketing |  |  | 2,197 |  |  |  | 1,746 |  |  |  | 1,790 |
General and administrative |  |  | 1,406 |  |  |  | 1,546 |  |  |  | 1,802 |
|  |  | 10,262 |  |  |  | 10,347 |  |  |  | 10,418 |

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