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Stock-Based Awards (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Option Activity | A summary of option activity is as follows:
|  | Options |  |  | Weighted- Average Exercise Price |
Outstanding January 1, 2013 |  |  | 12,760,191 |  |  | $ | 0.95 |
Granted |  |  | — |  |  |  | — |
Forfeitures or expirations |  |  | (40,000 | ) |  |  | 4.11 |
Exercised |  |  | (4,875,500 | ) |  |  | 0.38 |
Outstanding at December 31, 2013 |  |  | 7,844,691 |  |  | $ | 1.29 |
Granted |  |  | — |  |  |  | — |
Forfeitures or expirations |  |  | — |  |  |  | — |
Exercised |  |  | (2,514,621 | ) |  |  | 0.61 |
Outstanding at December 31, 2014 |  |  | 5,330,070 |  |  | $ | 1.61 |
Granted |  |  | — |  |  |  | — |
Forfeitures or expirations |  |  | — |  |  |  | — |
Exercised |  |  | (3,785,473 | ) |  |  | 1.19 |
Outstanding at December 31, 2015 |  |  | 1,544,597 |  |  | $ | 2.62 |
Summary of Stock Options Outstanding | The following table summarizes information on stock options outstanding at December 31, 2015:
|  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Number Outstanding at December 31, 2015 |  |  | Weighted- Average Remaining Contractual Life in Years |  |  | Weighted- Average Exercise Price |  |  | Number Exercisable at December 31, 2015 |  |  | Weighted- Average Exercise Price |  |  | Aggregate Intrinsic Value at December 31, 2015 |
$0.70 – $0.70 |  |  | 435,000 |  |  |  | 3.1 |  |  |  | 0.70 |  |  |  | 435,000 |  |  |  | 0.70 |  |  |  | 6,516 |
$1.07 – $1.07 |  |  | 263,635 |  |  |  | 1.3 |  |  |  | 1.07 |  |  |  | 263,635 |  |  |  | 1.07 |  |  |  | 3,852 |
$2.09 – $2.26 |  |  | 396,426 |  |  |  | 3.4 |  |  |  | 2.20 |  |  |  | 396,426 |  |  |  | 2.20 |  |  |  | 5,345 |
$5.05 – $5.05 |  |  | 285,000 |  |  |  | 5.1 |  |  |  | 5.05 |  |  |  | 210,000 |  |  |  | 5.05 |  |  |  | 2,232 |
$6.36 – $6.82 |  |  | 74,536 |  |  |  | 5.4 |  |  |  | 6.46 |  |  |  | 74,536 |  |  |  | 6.46 |  |  |  | 687 |
$7.01 – $8.51 |  |  | 90,000 |  |  |  | 5.7 |  |  |  | 7.48 |  |  |  | 90,000 |  |  |  | 7.48 |  |  |  | 738 |
|  |  | 1,544,597 |  |  |  | 3.5 |  |  | $ | 2.62 |  |  |  | 1,469,597 |  |  | $ | 2.50 |  |  | $ | 19,370 |
Summary of Restricted Shares Outstanding | The following table summarizes information about restricted shares outstanding for the years ended December 31, 2015, 2014 and 2013:
|  | Restricted Stock Awards |
Unvested balance at January 1, 2013 |  |  | 1,281,144 |
Granted |  |  | 981,810 |
Vested |  |  | (358,334 | )
Forfeited |  |  | (7,743 | )
Unvested balance at December 31, 2013 |  |  | 1,896,877 |
Granted |  |  | 623,088 |
Vested |  |  | (996,385 | )
Forfeited |  |  | (9,641 | )
Unvested balance at December 31, 2014 |  |  | 1,513,939 |
Granted |  |  | 886,413 |
Vested |  |  | (753,917 | )
Forfeited |  |  | (25,709 | )
Unvested balance at December 31, 2015 |  |  | 1,620,726 |
Summary of Stock-Based Compensation Expense | The following table summarizes the Company’s stock-based compensation expense:
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Employees and directors option awards |  | $ | 295 |  |  | $ | 487 |  |  | $ | 381 |
Employees and directors restricted stock awards |  |  | 10,605 |  |  |  | 7,650 |  |  |  | 6,078 |
Total |  | $ | 10,900 |  |  | $ | 8,137 |  |  | $ | 6,459 |
Summary of Unrecognized Stock-Based Compensation Expense and Remaining Vesting Period | The following table summarizes the Company’s unrecognized stock-based compensation expense and remaining vesting period as of December 31, 2015:
|  | Unrecognized Stock-Based Compensation |  |  | Average Remaining Vesting Period |
Employees and directors option awards |  | $ | 120 |  |  |  | 1.07 |
Employees and directors restricted stock awards |  | $ | 17,008 |  |  |  | 1.61 |

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