| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | Period [Axis] |
|---|
2016-01-01 - 2016-12-31 |
|---|
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |
Weighted-average assumptions | The assumptions used to compute the fair value of options for the years ending December 31, 2016, 2015 and 2014 were: | | | | | | | | | | | 2016 | | 2015 | | 2014 | Expected volatility | 68.1 | % | | 62.3 | % | | 61.0 | % | Risk-free interest rate | 1.98 | % | | 2.20 | % | | 2.50 | % | Expected life of options | 4.8 years |
| | 8.9 years |
| | 5.7 years |
| Dividend rate | — |
| | — |
| | — |
|
|
Stock option activity | A summary of stock option activity for the Equity Compensation Plans through December 31, 2016 was as follows: | | | | | | | | | | | | | | | Options | | Weighted Average Exercise Price | | Aggregate Intrinsic Value (thousands) | | Weighted Average Remaining Contractual Life | Balance at December 31, 2015 | 6,635,597 |
| | $ | 6.46 |
| | $ | 1.6 |
| | 5.8 years | Granted | 562,810 |
| | $ | 1.26 |
| | $ | — |
| | | Exercised | — |
| | $ | — |
| | $ | — |
| | | Forfeited and expired | (1,933,037 | ) | | $ | 6.79 |
| | $ | — |
| | | Balance at December 31, 2016 | 5,265,370 |
| | $ | 5.78 |
| | $ | — |
| | 4.4 years | Outstanding options less expected forfeitures at December 31, 2016 | 5,132,477 |
| | $ | 5.85 |
| | $ | — |
| | 4.3 years | Exercisable at December 31, 2016 | 4,035,588 |
| | $ | 6.68 |
| | $ | — |
| | 3.3 years |
|
Outstanding and exercisable stock options | The following table outlines our outstanding and exercisable stock options as of December 31, 2016: | | | | | | | | | | | | | | | | | | | | Options Outstanding | | Options Exercisable | Range of Option Exercise Price | | Outstanding Options | | Weighted Average Exercise Price | | Weighted Average Remaining Contractual Life | | Options Exercisable | | Weighted Average Exercise Price | $0.00 - $2.06 | | 552,810 |
| | $ | 1.19 |
| | 6.0 years | | 110,000 |
| | $ | 1.53 |
| $2.06 - $4.13 | | 1,350,984 |
| | $ | 2.67 |
| | 5.8 years | | 801,680 |
| | $ | 2.73 |
| $4.13 - $6.19 | | 572,000 |
| | $ | 4.84 |
| | 4.7 years | | 464,334 |
| | $ | 4.75 |
| $6.19 - $8.25 | | 1,898,576 |
| | $ | 7.06 |
| | 3.4 years | | 1,768,574 |
| | $ | 7.01 |
| $8.25 - $10.32 | | 252,500 |
| | $ | 9.09 |
| | 1.0 year | | 252,500 |
| | $ | 9.09 |
| $10.32 - $12.38 | | 305,000 |
| | $ | 11.04 |
| | 5.0 years | | 305,000 |
| | $ | 11.04 |
| $12.38 - $14.41 | | 325,500 |
| | $ | 12.92 |
| | 2.9 years | | 325,500 |
| | $ | 12.92 |
| $16.50 - $18.57 | | 8,000 |
| | $ | 16.63 |
| | 6.6 years | | 8,000 |
| | $ | 16.63 |
| All options | | 5,265,370 |
| | $ | 5.78 |
| | 4.4 years | | 4,035,588 |
| | $ | 6.68 |
|
|
Restricted stock award activity | A summary of restricted stock award activity through December 31, 2016 was as follows: | | | | | | | | | | | Restricted Stock | | Weighted Average Grant Date Fair Value | | Weighted Average Remaining Recognition Period | Balance at December 31, 2015 | 49,998 |
| | $ | 11.89 |
| | 2.2 years | Granted | 575,858 |
| | $ | 1.63 |
| | | Awards Vested | (78,500 | ) | | $ | 2.59 |
| | | Canceled | — |
| | $ | — |
| | | Balance at December 31, 2016 | 547,356 |
| | $ | 2.43 |
| | 2.2 years |
|
SAR activity | A summary of SAR activity through December 31, 2016 was as follows: | | | | | | | | | | | Stock Appreciation Rights | | Weighted Average Exercise Price | | Weighted Average Remaining Recognition Period | Balance at December 31, 2015 | 300,000 |
| | $ | 6.48 |
| | 0.0 years | Granted | — |
| | $ | — |
| |
| Exercised | — |
| | $ | — |
| |
| Canceled | — |
| | $ | — |
| |
| Balance at December 31, 2016 | 300,000 |
| | $ | 6.48 |
| | 0.0 years |
|