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Stockholders' Equity (Details Textual) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Stock Option Activity [Member]
Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2011
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2010
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2012
2004 stock incentive plan [Member]
Dec. 31, 2012
2004 stock incentive plan [Member]
Stock Option Activity [Member]
Dec. 31, 2012
2004 stock incentive plan [Member]
Restricted Stock Units (RSUs) [Member]
Installment
Dec. 31, 2011
2004 stock incentive plan [Member]
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2010
2004 stock incentive plan [Member]
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2012
2000 Plan and 2004 Plan [Member]
Dec. 31, 2012
2010 Employee Stock Purchase Plan [Member]
Apr. 30, 2011
Common Stock [Member]
Stockholders Equity (Textual) [Abstract]                              
Public offering, common stock shares issued                             6,700,000
Public offering price of common stock issued                             $ 7.70
Net proceeds from issuance under public offering                             $ 50,200,000
Purchase price of common stock percent under stock incentive plans               100.00%              
Stock option maximum term               10 years              
Share based vesting rights RSUs vested in equal monthly installments over a two-year service period               Options granted under the 2004 Plan generally vest over four years at a rate of 25 percent one year from the grant date and one thirty-sixth per month thereafter and expire ten years after the grant, or earlier upon employment termination These awards will vest as follows: one-third of the award will vest in a series of three successive equal annual installments          
Stock options vesting period 2 years             4 years              
Stock options expiration term               10 years              
Share-based compensation arrangement by share-based payment award, vesting percentage                 25.00%            
Stock reserved for issuance under 2000 and 2004 plan                         6,500,000 2,100,000  
Annual percentage increase in shares authorized               3.00%              
Annual increase in number of shares authorized               1,750,000              
Additional shares authorized under 2004 plan 1,576,644 1,361,332 1,349,832                        
Percentage of common stock purchased                           85.00%  
Purchase plan offering period                           2 years  
Purchase plan purchase period                           6 months  
Weighted-average estimated fair value of shares purchased under ESPP plan $ 2.51 $ 1.62 $ 2.76                        
Shares subject to repurchase rights       0                      
Restricted stock units issued         486,750         486,750 550,000 10,000      
Grant date fair value of restricted stock units issued                   $ 5.41 $ 2.55 $ 6.05      
Options weighted-average estimated fair value per share $ 3.76 $ 3.20 $ 3.85                        
Restricted stock units outstanding         1,036,750 551,667                  
Shares reserved for issuance of future awards                         2,749,117 1,708,315  
Aggregate value of shares vested in period         100,000 200,000 100,000                
Share-based compensation arrangement by share-based payment award, number of vesting installment                   3          
Share-based compensation arrangement by share-based payment award, vesting portion                   0.33          
Share-based compensation arrangement by share-based payment award, vesting portion on second anniversary               0.33              
Share-based compensation arrangement by share-based payment award, vesting portion on third anniversary               0.67              
Stockholders Equity (Additional Textual) [Abstract]                              
Preferred shares authorized 5,000,000                            
Specified stockholder ownership percentage 10.00%                            
Purchase price of common stock percent under stock incentive plans for specified stockholder 110.00%                            
Stock option maximum term for specified stockholder 5 years                            
Intrinsic value of options exercised 6,679,000 1,000,000 500,000                        
Aggregate intrinsic values outstanding options 8,821,000                            
Aggregate intrinsic values exercisable options 6,435,730                            
Options vested and expected to vest, aggregate intrinsic value $ 8,500,000 $ 100,000 $ 11,200,000                        
Stock options vesting period 2 years             4 years