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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Stock-Based Compensation |
Schedule of assumptions used in estimation of fair value of the share-based payment awards on the grant date |
|  | Year Ended December 31,
Employee stock options: |  | 2016 |  | 2015 |  | 2014
Risk-free interest rate |  | 1% - 2.1% |  | 0.6% -1.7% |  | 1.3% - 1.7%
Volatility |  | 61.4% - 65.0% |  | 55.7% - 59.3% |  | 53.7% - 57.5%
Expected life (years) |  | 3.0 - 5.0 |  | 3.0 - 5.0 |  | 4.0 - 5.0
Dividend yield |  | 0% |  | 0% |  | 0%
Summary of option and RSU activity under Amended and Restated 2000 Stock Option and Equity Incentive Plan and Amended and Restated 2010 Equity Incentive Plan | A summary of option activity under the Plans is presented below (in thousands, except exercise price):
|  |  |  | Options outstanding |
|  |  |  |  |  | Weighted |
|  | Shares |  |  |  | Average |
|  | Available |  | Number of |  | Exercise |
|  | for Grant |  | Shares |  | Prices |
Balance at January 1, 2014 |  | 42 |  | 672 |  | $ | 38.64 |
Additional shares authorized under the Amended 2010 Plan |  | 200 |  | — |  |  | — |
Restricted stock units granted |  | (50) |  | — |  |  | — |
Options granted |  | (17) |  | 17 |  | $ | 35.34 |
Options cancelled and returned to Plan |  | 49 |  | (49) |  | $ | 43.08 |
Options exercised |  | — |  | (41) |  | $ | 30.64 |
Options expired |  | (48) |  | — |  | $ | 43.20 |
Balance at December 31, 2014 |  | 176 |  | 599 |  | $ | 38.73 |
Additional shares authorized under the Amended 2010 Plan |  | 50 |  | — |  |  | — |
Restricted stock units cancelled and returned to Plan |  | 2 |  | — |  |  | — |
Options granted |  | (154) |  | 154 |  | $ | 20.22 |
Options cancelled and returned to Plan |  | 70 |  | (70) |  | $ | 35.23 |
Options exercised |  | — |  | (8) |  | $ | 16.37 |
Options expired |  | (38) |  | — |  | $ | 32.00 |
Balance at December 31, 2015 |  | 106 |  | 675 |  | $ | 35.14 |
Additional shares authorized under the Amended 2010 Plan |  | 50 |  | — |  |  | — |
Restricted stock units granted |  | (144) |  | — |  |  | — |
Restricted stock units cancelled and returned to Plan |  | 7 |  | — |  |  | — |
Options granted |  | (384) |  | 384 |  | $ | 6.96 |
Options cancelled and returned to Plan |  | 479 |  | (479) |  | $ | 35.64 |
Options cancelled and expired |  | — |  | (58) |  | $ | 44.80 |
Balance at December 31, 2016 |  | 114 |  | 522 |  | $ | 13.88 |
Summary of the inducement grant option activity | A summary of the inducement grant option activity is presented below (in thousands, except exercise price):
|  | Options Outstanding |
|  |  |  | Weighted |
|  |  |  | Average |
|  | Number of |  | Exercise |
|  | Shares |  | Prices |
Balance at January 1, 2014 |  | 318 |  | $ | 44.23 |
Granted |  | 41 |  | $ | 36.80 |
Exercised |  | (7) |  | $ | 25.87 |
Expired |  | (129) |  | $ | 55.75 |
Balance at December 31, 2014 |  | 223 |  | $ | 36.78 |
Exercised |  | (52) |  | $ | 15.48 |
Expired |  | (7) |  | $ | 31.79 |
Balance at December 31, 2015 |  | 164 |  | $ | 43.74 |
Cancelled |  | (164) |  | $ | 43.74 |
Balance at December 31, 2016 |  | — |  | $ | — |
Summary of RSU activity under the Plans | A summary of restricted stock unit activity under the Plans is presented below (in thousands, except fair value):
|  |  |  | Weighted |
|  |  |  | Average |
|  | Number of |  | Grant-Date |
|  | Shares |  | Fair Value |
Non-vested shares at January 1, 2014 |  | 2 |  | $ | 44.60 |
Granted |  | 50 |  | $ | 46.11 |
Vested |  | (13) |  | $ | 45.83 |
Cancelled |  | — |  | $ | 46.20 |
Non-vested shares at December 31, 2014 |  | 39 |  | $ | 46.11 |
Vested |  | (13) |  | $ | 45.97 |
Cancelled |  | (2) |  | $ | 46.20 |
Non-vested shares at December 31, 2015 |  | 24 |  | $ | 46.17 |
Granted |  | 144 |  | $ | 5.30 |
Vested |  | (12) |  | $ | 46.06 |
Cancelled |  | (8) |  | $ | 15.67 |
Non-vested shares at December 31, 2016 |  | 148 |  | $ | 8.13 |
Summary of significant ranges of outstanding and exercisable options | The following table summarizes significant ranges of outstanding and exercisable options as of December 31, 2016 (in thousands, except contractual life and exercise price):
|  | Options Outstanding |  | Options Exercisable |  |  |  |
|  |  |  | Weighted |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  | Average |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  | Remaining |  | Weighted |  |  |  | Weighted |  |  |  |
|  |  |  | Contractual |  | Average |  |  |  | Average |  | Aggregate |
|  | Number |  | Life |  | Exercise |  | Number |  | Exercise |  | Intrinsic |
Range of Exercise Price |  | Outstanding |  | (in Years) |  | Price |  | Exercisable |  | Price |  | value |
$3.80 - $7.19 |  | 45 |  | 8.68 |  | $ | 5.12 |  | 8 |  | $ | 5.30 |  |  |  |
$7.20 - $16.99 |  | 325 |  | 9.39 |  | $ | 7.20 |  | 36 |  | $ | 7.20 |  |  |  |
$17.00 - $30.99 |  | 84 |  | 6.33 |  | $ | 22.39 |  | 66 |  | $ | 22.92 |  |  |  |
$31-00 - $54.29 |  | 58 |  | 2.72 |  | $ | 38.41 |  | 57 |  | $ | 38.32 |  |  |  |
$54.30 - $61.09 |  | 6 |  | 0.50 |  | $ | 54.30 |  | 6 |  | $ | 54.30 |  |  |  |
$61.10 - $61.10 |  | 4 |  | 0.32 |  | $ | 61.10 |  | 4 |  | $ | 61.10 |  |  |  |
$3.80 - $61.10 |  | 522 |  | 7.82 |  | $ | 13.88 |  | 177 |  | $ | 25.83 |  | $ | — |
Vested and expected to vest |  | 522 |  | 7.82 |  | $ | 14.34 |  |  |  |  |  |  | $ | — |
Exercisable |  | 177 |  | 5.38 |  | $ | 25.83 |  |  |  |  |  |  | $ | — |

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