Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity and Stock Based Compensation - Plans (Details)

v3.3.1.900
Stockholders' Equity and Stock Based Compensation - Plans (Details)
1 Months Ended 12 Months Ended
Mar. 01, 2002
shares
Aug. 31, 2006
installment
shares
Dec. 31, 2015
installment
shares
Dec. 31, 2014
installment
shares
Dec. 31, 2013
installment
shares
Dec. 31, 2012
installment
shares
Dec. 31, 2011
installment
shares
Dec. 31, 2010
installment
shares
Dec. 31, 2009
installment
shares
Dec. 31, 2008
installment
shares
Dec. 31, 2007
installment
shares
Jun. 06, 2012
shares
Jun. 14, 2006
shares
May. 07, 1998
shares
1995 Plan                            
Stock-based compensation                            
Number of shares of common stock initially available for award                           1,137,500
Expiration period     10 years                      
1995 Director Plan                            
Stock-based compensation                            
Number of shares of common stock initially available for award                           187,500
Expiration period     10 years                      
Vesting period     5 years                      
Period from grant date after which awards begin to vest     1 year                      
1995 Director Plan | Vesting of awards in equal quarterly installments from expiration of one year from the date of grant                            
Stock-based compensation                            
Percentage of award vesting     5.00%                      
1995 Director Plan | Vesting of awards in one year from the date of grant                            
Stock-based compensation                            
Percentage of award vesting     20.00%                      
1995 Plan and 1995 Director Plan                            
Stock-based compensation                            
Options surrendered (in shares) 303,550                          
2006 Plan                            
Stock-based compensation                            
Number of shares of common stock initially available for award                         800,000  
Options reserved for future issuance (in shares)     0                      
2006 Plan | Restricted stock                            
Stock-based compensation                            
Granted (in shares)   315,000     56,500 92,000 15,000 150,500 140,000 57,500 30,000      
Number of equal quarterly installments for vesting of awards | installment   20       20 20 20 20 20 20      
Forfeited (in shares)         775 3,525 8,375 5,875   3,500 12,500      
2006 Plan | Restricted stock | CEO                            
Stock-based compensation                            
Granted (in shares)   200,000                        
Number of equal quarterly installments for vesting of awards | installment   40                        
2012 Plan                            
Stock-based compensation                            
Number of shares of common stock initially available for award                       600,000    
Options reserved for future issuance (in shares)     474,313                      
2012 Plan | Restricted stock                            
Stock-based compensation                            
Granted (in shares)     44,000 98,689                    
Number of equal quarterly installments for vesting of awards | installment     16                      
Forfeited (in shares)     4,465 34,487                    
2012 Plan | Restricted stock | Minimum                            
Stock-based compensation                            
Number of equal quarterly installments for vesting of awards | installment       1                    
2012 Plan | Restricted stock | Maximum                            
Stock-based compensation                            
Number of equal quarterly installments for vesting of awards | installment       20                    
2006 Plan and 2012 Plan | Restricted stock                            
Stock-based compensation                            
Granted (in shares)     44,000 98,689 56,500                  
Number of equal quarterly installments for vesting of awards | installment         20                  
Forfeited (in shares)     4,465 34,487 775                  
2006 Plan and 2012 Plan | Restricted stock | CEO                            
Stock-based compensation                            
Granted (in shares)         40,000                  
Number of equal quarterly installments for vesting of awards | installment         16