Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Stock Activity) (Details)

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Stockholders' Equity (Stock Activity) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Shares Available For Grant [Roll Forward]    
Shares Available for Grant, Shares Expired (1,122,311)  
Stock Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding, beginning of period (number of options) 7,903,622 7,795,693
Grants (number of options) 1,520,950 1,751,506
Exercises (number of options) (707,599) (1,167,119)
Early exercised options repurchased (number of options)   (476,458)
Forfeited/Cancelled (number of options) (2,584,332) 0
Outstanding, end of period (number of options) 6,132,641 7,903,622
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]    
Outstanding, beginning of period, weighted average exercise price per share (dollars per option) $ 7.35 $ 6.27
Grants, weighted average exercise price per share (dollars per option) $ 3.42 $ 9.33
Exercises, weighted average exercise price per share (dollars per option) $ 1.78 $ 2.21
Early exercised option repurchased, weighted average exercise price per share (dollars per option)   $ 9.51
Forfeited/Cancelled, weighted average exercise price per share (dollars per option) $ 0.00 $ 0.00
Outstanding, end of period, weighted average exercise price per share (dollars per option) $ 6.65 $ 7.35
Shares Available For Grant [Roll Forward]    
Shares Available for Grant, beginning of period (shares) 1,507,299 1,935,424
Shares Available for Grant, authorized (shares) 3,712,138 1,393,142
Shares Available for Grant, granted (shares) (1,520,950) (1,751,506)
Shares Available for Grant, Early exercised options repurchased (shares)   476,458
Shares Available for Grant, Forfeited/Cancelled (shares) 2,584,332 32,048
Shares Available for Grant, end of period (shares) 3,767,390 1,507,299
Restricted stock units [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Grants (number of options) 0  
Forfeited/Cancelled (number of options) 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]    
Grants, weighted average exercise price per share (dollars per option) $ 0.00  
Forfeited/Cancelled, weighted average exercise price per share (dollars per option) $ 8.23  
Shares Available For Grant [Roll Forward]    
Shares Available for Grant, granted (shares) (1,962,078)  
Shares Available for Grant, Forfeited/Cancelled (shares) 568,960