Annual report pursuant to Section 13 and 15(d)

Subsequent Events - 2015 Plan Narrative (Details)

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Subsequent Events - 2015 Plan Narrative (Details) - Stock Awards - 2015 Stock Awards Plan - $ / shares
12 Months Ended
Feb. 05, 2020
Feb. 06, 2019
Feb. 07, 2018
Feb. 08, 2017
Dec. 31, 2019
Dec. 31, 2018
Subsequent Event [Line Items]            
Granted (in shares)   44,949 65,527 44,687    
Annual vesting rate         20.00%  
Subsequent Event            
Subsequent Event [Line Items]            
Granted (in shares) 45,418          
Granted (in dollars per share) $ 12.995          
Minimum            
Subsequent Event [Line Items]            
Annual vesting rate         20.00% 20.00%
Minimum | Subsequent Event            
Subsequent Event [Line Items]            
Annual vesting rate 20.00%          
Maximum            
Subsequent Event [Line Items]            
Annual vesting rate         33.00% 33.00%
Maximum | Subsequent Event            
Subsequent Event [Line Items]            
Annual vesting rate 33.00%