Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Equity Compensation Plan - Narrative (Details)

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Stockholders' Equity - Equity Compensation Plan - Narrative (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2016
Dec. 31, 2009
Dec. 31, 2018
Oct. 31, 2018
Jun. 30, 2017
Dec. 31, 2015
Jun. 30, 2014
Apr. 30, 2011
Mar. 31, 2010
Stockholders’ Equity                      
Granted 1,167,749 417,120                  
Outstanding stock options 1,480,139 437,603     66,422            
Dividend yield                      
Stockholders’ Equity                      
Annual interest on outstanding balance 0.00%                    
2009 Stock Incentive Plan                      
Stockholders’ Equity                      
Number of shares authorized       21,739           65,217 21,739
Expiration term       10 years              
Common shares available for issuance                   86,957  
Outstanding stock options 6,378 6,752                  
2014 Stock Option Plan                      
Stockholders’ Equity                      
Number of shares authorized                 50,000    
Stock Incentive Plan, shares authorized increased               60,000      
Outstanding stock options 30,354 32,610                  
2009 and 2014 Plans                      
Stockholders’ Equity                      
Granted     300,000                
2017 Stock Option Plan                      
Stockholders’ Equity                      
Number of shares authorized             500,000        
Outstanding stock options 42,932       49,340            
2018 Stock Option Plan                      
Stockholders’ Equity                      
Number of shares authorized           4,000,000          
Increase in the number of shares available for grant   4,000,000                  
Common shares available for issuance 1,788,730                    
Outstanding stock options 1,400,475 532,752