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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