Annual report pursuant to Section 13 and 15(d)

Subsequent Events - 2015 Plan Narrative (Details)

v3.20.4
Subsequent Events - 2015 Plan Narrative (Details) - Stock Awards - 2015 Stock Awards Plan - $ / shares
12 Months Ended
Feb. 10, 2021
Nov. 10, 2020
Feb. 05, 2020
Feb. 06, 2019
Dec. 31, 2020
Subsequent Event [Line Items]          
Granted (in shares)   50,000 45,418 44,949  
Award vesting rights, percentage         20.00%
Subsequent Event          
Subsequent Event [Line Items]          
Granted (in shares) 15,181        
Granted (in dollars per share) $ 8.575        
Minimum          
Subsequent Event [Line Items]          
Award vesting rights, percentage     20.00% 20.00%  
Minimum | Subsequent Event          
Subsequent Event [Line Items]          
Award vesting rights, percentage 20.00%