Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Stock Option Activities) (Details)

v3.21.1
Stockholders' Equity (Stock Option Activities) (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Options rollforward      
Stock Options, Outstanding, Number, Beginning Balance 1,241,675 1,241,675  
Options granted   0  
Options forfeited (100,000)    
Options, Outstanding, Number, Ending Balance 1,141,675 1,241,675 1,241,675
Options vested and exercisable 784,902    
Weighted Average Exercise Price      
Weighted Average Exercise Price, Beginning $ 5.73 $ 5.73  
Weighted Average Exercise Price, options granted   0  
Weighted Average Exercise Price, options forfeited 5.73    
Weighted Average Exercise Price, Ending 5.73 $ 5.73 $ 5.73
Weighted Average Exercise Price, options vested and exercisable $ 5.73    
Weighted Average Remaining Contractual Life, Options outstanding (in years) 6 years 3 months 21 days 7 years 3 months 21 days 8 years 3 months 21 days
Weighted Average Remaining Contractual Life, Options vested and exercisable (in years) 6 years 3 months 21 days    
Unrecognized share-based compensation $ 0.1    
Unrecognized compensation recognition period 9 months 18 days    
Estimated forfeiture rate, options (as a percent) 0.00%