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Stock-Based Compensation (Details) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Options
Dec. 31, 2012
Options
Dec. 31, 2011
Options
Jun. 30, 2011
Options
Executive vice president
Dec. 31, 2013
Inducement grant options
Dec. 31, 2012
Inducement grant options
Dec. 31, 2011
Inducement grant options
Jun. 30, 2010
ESPP
Item
Dec. 31, 2013
ESPP
Dec. 31, 2012
ESPP
Dec. 31, 2011
ESPP
Dec. 31, 2013
ESPP
Minimum
Jun. 30, 2010
ESPP
Maximum
Dec. 31, 2013
ESPP
Maximum
Dec. 31, 2013
Plans
Options
Dec. 31, 2012
Plans
Options
Dec. 31, 2011
Plans
Options
Dec. 31, 2013
Plans
RSU's
Dec. 31, 2013
Amended 2000 Plan
Dec. 31, 2013
Amended 2000 Plan
Options
Jun. 30, 2010
2010 Plan
Dec. 31, 2013
2010 Plan
Options
Jun. 30, 2010
2010 Plan
Options
Jun. 30, 2010
2010 Plan
Options
Minimum
Jun. 30, 2010
2010 Plan
Options
Maximum
Stock-Based Compensation                                                        
Number of shares outstanding               3,178,000 3,358,000 4,815,000               6,727,000 6,872,000 6,528,000     1,879,000          
Weighted-average exercise price (in dollars per share)               $ 4.42 $ 4.29 $ 3.29               $ 3.86 $ 4.05 $ 4.48     $ 3.79          
Number of shares reserved for issuance                     2,000,000                         4,000,000        
Annual increase in the share reserved for issuance (in shares)                                   500,000 500,000 500,000       500,000        
Term of Plan                                               10 years     6 years 10 years
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      
Employee Stock Purchase Plan                                                        
Number of shares reserved for issuance                     2,000,000                         4,000,000        
Maximum amount of shares that eligible employee may purchase annually (in dollars)                               $ 25,000                        
Number of offering periods                     2                                  
Offering period                     6 months                                  
Purchase price to be paid by participants as a percentage of price per share either at the beginning or the end of each six-month offering period, whichever is less                     85.00%                                  
Shares of common stock issued under the plan                       275,000 351,000 313,000                            
Aggregate purchase price (in dollars)                       800,000 1,100,000 1,100,000                            
Shares authorized and unissued                       1,061,000           422,000 1,265,000 1,977,000   0            
Stock-based compensation expense 3,700,000 3,800,000 3,800,000                                                  
Tax benefits associated with exercise of stock options       $ 0 $ 0 $ 0                                            
Option granted as compensation for the consulting services (in shares)             675,000 347,000 350,000 400,000               1,543,000 1,827,000 2,201,000                
Assumptions used in estimation of fair value of the share-based payment awards on the grant date                                                        
Risk-free interest rate, minimum (as a percent)                       0.50% 0.20% 0.20%                            
Risk-free interest rate, maximum (as a percent)                       1.70% 0.80% 1.70%                            
Volatility, minimum (as a percent)                       57.70% 59.50% 40.70%                            
Volatility, maximum (as a percent)                       62.90% 73.10% 65.40%                            
Expected life                         4 years 4 years 4 years   5 years                      
Dividend yield (as a percent)                       0.00% 0.00% 0.00%                            
Available for Grant                                                        
Balance at the beginning of the period (in shares)                                   1,265,000 1,977,000 3,650,000   0            
Additional shares authorized under the 2010 Plan                                   500,000 500,000 500,000       500,000        
Restricted stock units granted (in shares)                                         (35,000)              
Options granted (in shares)                                   (1,543,000) (1,827,000) (2,201,000)                
Options cancelled (in shares)                                   1,123,000 1,217,000 743,000                
Options expired (in shares)                                   (888,000) (602,000) (715,000)                
Balance at the end of the period (in shares)                       1,061,000           422,000 1,265,000 1,977,000   0            
Number of Shares                                                        
Balance at the beginning of the period (in shares)               3,358,000 4,815,000 4,812,000               6,872,000 6,528,000 5,594,000     1,879,000          
Options granted (in shares)             675,000 347,000 350,000 400,000               1,543,000 1,827,000 2,201,000                
Options cancelled (in shares)               (7,000) (550,000) (48,000)               (1,123,000) (1,217,000) (743,000)                
Options exercised (in shares)               (520,000) (1,257,000) (349,000)               (565,000) (266,000) (524,000)                
Balance at the end of the period (in shares)               3,178,000 3,358,000 4,815,000               6,727,000 6,872,000 6,528,000     1,879,000          
Weighted Average Exercise Prices                                                        
Balance at the beginning of the period (in dollars per share)               $ 4.29 $ 3.29 $ 2.92               $ 4.05 $ 4.48 $ 4.64     $ 3.79          
Options granted (in dollars per share)               $ 3.94 $ 3.92 $ 6.06               $ 4.27 $ 3.19 $ 4.13                
Options cancelled (in dollars per share)               $ 3.45 $ 1.55 $ 1.54               $ 6.00 $ 5.42 $ 5.41                
Options exercised (in dollars per share)               $ 3.28 $ 1.55 $ 1.55               $ 3.05 $ 2.38 $ 3.34                
Options expired (in dollars per share)                                   $ 6.49 $ 6.89 $ 5.41                
Balance at the end of the period (in dollars per share)               $ 4.42 $ 4.29 $ 3.29               $ 3.86 $ 4.05 $ 4.48     $ 3.79