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Stockholders' Equity and Stock Option Plans - Share Based Awards Narrative (Details)
12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
May 08, 2007
May 11, 2010
Director Stock Plan, 2010
Dec. 31, 2012
Equity Plan, 2007
Dec. 31, 2011
Equity Plan, 2007
May 08, 2007
Equity Plan, 2007
Dec. 31, 2012
Employee Stock Purchase Plan, 2007
Jul. 01, 2007
Employee Stock Purchase Plan, 2007
Dec. 31, 2011
Former 1999 Stock Option Plan
Dec. 31, 2012
Officer and Employee
Dec. 31, 2012
Nonemployee Director
Dec. 31, 2005
Nonemployee Director
Dec. 31, 2012
Nonemployee Director
Immediately Upon Grant
Dec. 31, 2012
Nonemployee Director
Vesting Rate, Year One
Dec. 31, 2012
Nonemployee Director
Vesting Rate, Year Two
Dec. 31, 2012
Nonemployee Director
Vesting Rate, Year Three
Dec. 31, 2012
Nonemployee Director
Vesting Rate Year Four
Dec. 31, 2012
Common Stock
Director Stock Plan, 2010
Dec. 31, 2011
Common Stock
Director Stock Plan, 2010
Dec. 31, 2005
Prior to January 1, 2006
Stock options
Officer and Employee
Dec. 31, 2005
Prior to January 1, 2006
Stock options
Officer and Employee
Immediately Upon Grant
Dec. 31, 2005
Prior to January 1, 2006
Stock options
Officer and Employee
Vesting Rate, Year One
Dec. 31, 2005
Prior to January 1, 2006
Stock options
Officer and Employee
Vesting Rate, Year Two
Dec. 31, 2005
Prior to January 1, 2006
Stock options
Officer and Employee
Vesting Rate, Year Three
Dec. 31, 2005
Prior to January 1, 2006
Stock options
Officer and Employee
Vesting Rate Year Four
Dec. 31, 2012
Subsequent to January 1, 2006
Unvested restricted stock
Dec. 31, 2012
Subsequent to January 1, 2006
Unvested restricted stock
Vesting Rate, Year One
Dec. 31, 2012
Subsequent to January 1, 2006
Unvested restricted stock
Vesting Rate, Year Two
Dec. 31, 2012
Subsequent to January 1, 2006
Unvested restricted stock
Vesting Rate, Year Three
Dec. 31, 2012
Subsequent to January 1, 2006
Unvested restricted stock
Vesting Rate Year Four
Dec. 31, 2012
Subsequent to January 1, 2006
Unvested restricted stock
Vesting Rate Year Five
Dec. 31, 2012
Minimum
Dec. 31, 2012
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                  
Number of common shares approved to be issued in each plan   500,000 150,000         200,000                                                  
Shares awarded in period from plan       0 0                         5,270 5,590                            
Approved payroll deduction to purchase shares, percentage                                                               1.00% 15.00%
Discount from closing market price at end of each quarter             5.00%                                                    
Number of shares available for future grants under plan 135,850         298,159 195,316                                                    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted                 0                                                
Vesting percentage                         20.00% 20.00% 20.00% 20.00% 20.00%       20.00% 20.00% 20.00% 20.00% 20.00%   20.00% 20.00% 20.00% 20.00% 20.00%    
Award vesting period                       4 years               4 years           5 years              
Expiration period of grants                   10 years 7 years