v2.4.0.6
Stock Based Compensation (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Number of Shares [Roll Forward]        
Options outstanding at December 31, 2011 (in shares)     891,751  
Granted (in shares)     932,384  
Exercised (in shares)     0  
Forfeited (in shares)     (78,525)  
Cancelled (in shares)     (55,251)  
Options outstanding at September 30, 2012 (in shares) 1,690,359   1,690,359  
Vested and expected to vest at September 30, 2012 (in shares) 1,558,961   1,558,961  
Exercisable at September 30, 2012 (in shares) 310,000   310,000  
Non vested     1,380,359  
Weighted average remaining recognition period (in years)     3 years 7 months 24 days  
Weighted Average Exercise Price [Roll Forward]        
Options outstanding at December 31, 2011 (in dollars per share)     $ 5.15  
Granted (in dollars per share)     $ 3.63  
Exercised (in dollars per share)     $ 0  
Forfeited (in dollars per share)     $ 3.03  
Cancelled (in dollars per share)     $ 18.93  
Options outstanding at September 30, 2012 (in dollars per share) $ 3.96   $ 3.96  
Vested and expected to vest at September 30, 2012 (in dollars per share) $ 4.00   $ 4.00  
Exercisable at September 30, 2012 (in dollars per share) $ 5.72   $ 5.72  
Weighted Average Remaining Contractual Life in Years [Abstract]        
Options outstanding at September 30, 2012     8 years 1 month 10 days  
Vested and expected to vest at September 30, 2012     7 years 11 months 19 days  
Exercisable at September 30, 2012     1 year 6 months 4 days  
Aggregate Intrinsic Value [Abstract]        
Options outstanding at September 30, 2012 $ 1,600,309,000   $ 1,600,309,000  
Vested and expected to vest at September 30, 2012 1,464,563,000   1,464,563,000  
Exercisable at September 30, 2012 156,712,000   156,712,000  
Fair value and assumptions used in determining fair value of stock options [Abstract]        
Volatility (in hundredths)     1.20%  
Risk-free interest rate (in hundredths)     0.60%  
Dividend yield (in hundredths)     0.00%  
Expected option term (in years)     6 years 3 months  
Unrecognized compensation expense related to unvested stock options 3,300,000   3,300,000  
Expected weighted average period for recognizing unrecognized compensation expense     3 years 7 months 24 days  
Restricted Stock and Restricted Stock Units [Abstract]        
Number of common shares to be received in lieu of per RSU (in shares) 1   1  
Requisite service period of RS and RSUs     3 years  
Number of RSU's [Roll Forward]        
Outstanding at December 31, 2011 (in shares)     487,025  
Granted (in shares)     61,011  
Released (in shares)     (43,819)  
Forfeited (in shares)     (8,559)  
Outstanding at September 30, 2012 (in shares) 495,658   495,658  
Expected to Vest (in shares) 351,013   351,013  
Weighted Average Grant Price [Roll Forward]        
Outstanding at December 31, 2011 (in dollars per share)     $ 6.37  
Granted (in dollars per share)     $ 3.44  
Released (in dollars per share)     $ 5.98  
Forfeited (in dollars per share)     $ 5.78  
Outstanding at September 30, 2012 (in dollars per share) $ 5.11   $ 5.11  
Expected to Vest (in dollars per share) $ 5.68   $ 5.68  
Unrecognized compensation expense related to unvested RSU's 1,200,000   1,200,000  
Common stock were reserved for issuance (in shares) 1,000,000   1,000,000  
Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of equity compensation plans 2   2  
Term of equity compensation plan (in years)     P10Y  
Number of Shares [Roll Forward]        
Weighted average remaining recognition period (in years)     3 years 7 months 24 days  
Fair value and assumptions used in determining fair value of stock options [Abstract]        
Allocated share-based compensation expense 400,000 100,000 700,000 200,000
Expected weighted average period for recognizing unrecognized compensation expense     3 years 7 months 24 days  
Options [Member] | General and Administrative Expense [Member]
       
Fair value and assumptions used in determining fair value of stock options [Abstract]        
Allocated share-based compensation expense 300,000 100,000 500,000 100,000
Options [Member] | Research and Development Expense [Member]
       
Fair value and assumptions used in determining fair value of stock options [Abstract]        
Allocated share-based compensation expense 100,000   200,000 40,000
Options [Member] | Maximum [Member] | Research and Development Expense [Member]
       
Fair value and assumptions used in determining fair value of stock options [Abstract]        
Allocated share-based compensation expense   100,000    
Options [Member] | 2000 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Additional shares of common stock authorized (in shares)     3,000,000  
Reserved for future issuance maximum shares of common stock (in shares) 3,900,000   3,900,000  
Options [Member] | 2000 ESPP [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Reserved for future issuance maximum shares of common stock (in shares) 150,000   150,000  
Restricted Stock Units (RSUs) [Member]
       
Number of Shares [Roll Forward]        
Weighted average remaining recognition period (in years)     1 year 18 days  
Fair value and assumptions used in determining fair value of stock options [Abstract]        
Allocated share-based compensation expense 100,000 400,000 800,000 900,000
Expected weighted average period for recognizing unrecognized compensation expense     1 year 18 days  
Restricted Stock Units (RSUs) [Member] | General and Administrative Expense [Member]
       
Fair value and assumptions used in determining fair value of stock options [Abstract]        
Allocated share-based compensation expense 100,000 300,000 500,000 600,000
Restricted Stock Units (RSUs) [Member] | Research and Development Expense [Member]
       
Fair value and assumptions used in determining fair value of stock options [Abstract]        
Allocated share-based compensation expense $ 100,000 $ 100,000 $ 300,000 $ 300,000