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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2016 | Jun. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Options |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Unamortized compensation cost, net of expected forfeitures |  |  | $ 2,400 |  |
Fair value of vested options and awards |  |  | $ 3,200 |  |
Weighted average expected period over which the expense is to be recognized |  |  | 2 years |  |
Tax benefits associated with exercise of stock options |  |  | $ 0 | $ 0 | $ 0
Inducement grant options |  |  |  |  |
Shares Available for Grant |  |  |  |  |
Options expired (in shares) |  |  | (16,000) | (1,290,000) |
Number of Shares |  |  |  |  |
Balance at the beginning of the period (in shares) | 1,640,000 |  | 2,233,000 | 3,178,000 | 3,358,000
Options granted (in shares) |  |  |  | 418,000 | 347,000
Options cancelled (in shares) |  |  | (59,000) |  | (7,000)
Options exercised (in shares) |  |  | (518,000) | (73,000) | (520,000)
Options expired (in shares) |  |  | (16,000) | (1,290,000) |
Balance at the end of the period (in shares) |  |  | 1,640,000 | 2,233,000 | 3,178,000
Weighted Average Exercise Prices |  |  |  |  |
Balance at the beginning of the year (in dollars per share) | $ 4.37 |  | $ 3.68 | $ 4.42 | $ 4.29
Options granted (in dollars per share) |  |  |  | 3.68 | 3.94
Options cancelled (in dollars per share) |  |  | 3.62 |  | 3.45
Options exercised (in dollars per share) |  |  | 1.55 | 2.59 | 3.28
Options expired (in dollars per share) |  |  | 1.55 | 5.57 |
Balance at the end of the year (in dollars per share) |  |  | $ 4.37 | $ 3.68 | $ 4.42
RSU's |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Unamortized compensation cost, net of expected forfeitures |  |  | $ 600 |  |
Weighted average expected period over which the expense is to be recognized |  |  | 1 year 3 months 18 days |  |
The Plans | Options |  |  |  |  |
Shares Available for Grant |  |  |  |  |
Balance at the beginning of the year (in shares) | 1,059,000 |  | 1,760,000 | 422,000 | 1,265,000
Options granted (in shares) |  |  | (1,538,000) | (174,000) | (1,543,000)
Options cancelled (in shares) |  |  | 701,000 | 496,000 | 1,123,000
Options expired (in shares) |  |  | (386,000) | (481,000) | (888,000)
Balance at the end of the year (in shares) |  |  | 1,059,000 | 1,760,000 | 422,000
Number of Shares |  |  |  |  |
Balance at the beginning of the period (in shares) | 6,749,000 |  | 5,994,000 | 6,727,000 | 6,872,000
Options granted (in shares) |  |  | 1,538,000 | 174,000 | 1,543,000
Options cancelled (in shares) |  |  | (701,000) | (496,000) | (1,123,000)
Options exercised (in shares) |  |  | (82,000) | (411,000) | (565,000)
Options expired (in shares) |  |  | (386,000) | (481,000) | (888,000)
Balance at the end of the period (in shares) |  |  | 6,749,000 | 5,994,000 | 6,727,000
Weighted Average Exercise Prices |  |  |  |  |
Balance at the beginning of the year (in dollars per share) | $ 3.51 |  | $ 3.87 | $ 3.86 | $ 4.05
Options granted (in dollars per share) |  |  | 2.02 | 3.53 | 4.27
Options cancelled (in dollars per share) |  |  | 3.52 | 4.31 | 6.00
Options exercised (in dollars per share) |  |  | 1.64 | 3.06 | 3.05
Options expired (in dollars per share) |  |  | 3.20 | 4.32 | 6.49
Balance at the end of the year (in dollars per share) |  |  | $ 3.51 | $ 3.87 | $ 3.86
The Plans | RSU's |  |  |  |  |
Shares Available for Grant |  |  |  |  |
Restricted stock units granted (in shares) |  |  |  | (508,000) | (35,000)
Restricted stock units cancelled (in shares) |  |  | 22,000 | 5,000 |
Amended 2000 Plan |  |  |  |  |
Shares Available for Grant |  |  |  |  |
Balance at the beginning of the year (in shares) | 0 |  |  |  |
Balance at the end of the year (in shares) |  |  | 0 |  |
Amended 2000 Plan | Options |  |  |  |  |
Number of Shares |  |  |  |  |
Balance at the beginning of the period (in shares) | 580,000 |  |  |  |
Balance at the end of the period (in shares) |  |  | 580,000 |  |
Weighted Average Exercise Prices |  |  |  |  |
Balance at the beginning of the year (in dollars per share) | $ 4.48 |  |  |  |
Balance at the end of the year (in dollars per share) |  |  | $ 4.48 |  |
Amended 2010 Plan |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Number of shares reserved for issuance |  |  |  | 4,000,000 |
Term of Plan |  |  | 10 years |  |
Shares Available for Grant |  |  |  |  |
Additional shares authorized | 500,000 |  |  |  |
Amended 2010 Plan | Options |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Maximum annual option grants or other awards to the entity's non-employee directors (in shares) |  |  | 40,000 |  |
Maximum one-time grant of an option or other awards to the entity's non-employee directors (in shares) |  |  | 120,000 |  |
Maximum term of options granted |  |  | 10 years |  |
Minimum percentage of voting rights required for applicability of a specific expiration term |  |  | 10.00% |  |
Maximum expiration term of options granted |  |  | 5 years |  |
Vesting period |  |  | 4 years |  |
Shares Available for Grant |  |  |  |  |
Additional shares authorized |  | 1,500,000 | 500,000 | 2,000,000 | 500,000
Amended 2010 Plan | Options | Minimum |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Term of Plan |  |  | 6 years |  |
Amended 2010 Plan | Options | Maximum |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Term of Plan |  |  | 10 years |  |

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