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Stockholders' Equity - Outstanding Options Granted to Consultants for Sales and Pre-marketing Services (Details)
12 Months Ended 96 Months Ended
Dec. 31, 2021
$ / shares
shares
Dec. 31, 2021
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options exercisable at the end of the year (in shares) 787,775 787,775
Options exercisable at the end of the year, weighted average exercise price (in dollars per share) | $ / shares $ 7.106 $ 7.106
Granted (in shares) 0  
The 2005 Stock Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares) 0 0
The 2013 Omnibus Equity Award Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares) 0  
Consultants    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options exercisable at the end of the year (in shares) 26,250 26,250
Consultants | The 2005 Stock Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares) 0  
Consultants | The 2013 Omnibus Equity Award Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares) 0  
August 2013 | Consultants    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options exercisable at the end of the year (in shares) 6,000 6,000
Options exercisable at the end of the year, weighted average exercise price (in dollars per share) | $ / shares $ 7.047 $ 7.047
Exercisable through August 2023  
March 2014 | Consultants    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options exercisable at the end of the year (in shares) 4,950 4,950
Options exercisable at the end of the year, weighted average exercise price (in dollars per share) | $ / shares $ 13.287 $ 13.287
Exercisable through March 2024  
May 2014 | Consultants    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options exercisable at the end of the year (in shares) 3,000 3,000
Options exercisable at the end of the year, weighted average exercise price (in dollars per share) | $ / shares $ 7.337 $ 7.337
Exercisable through May 2024  
November 2014 | Consultants    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options exercisable at the end of the year (in shares) 9,300 9,300
Options exercisable at the end of the year, weighted average exercise price (in dollars per share) | $ / shares $ 7.220 $ 7.220
Exercisable through November 2024  
February 2016 | Consultants    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options exercisable at the end of the year (in shares) 3,000 3,000
Options exercisable at the end of the year, weighted average exercise price (in dollars per share) | $ / shares $ 5.623 $ 5.623
Exercisable through February 2026