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Stock-based Compensation - Narrative (Details) - USD ($)
6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2015
Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options issued to purchase shares of common stock 280,000          
Vesting period 5 years          
Strike price $ 3.81          
Expiration date Jun. 30, 2030          
Estimated value of options issued to purchase shares of common stock $ 290,000          
Share-based compensation expense   $ 14,000        
Share-based compensation expense not yet recognized   $ 276,000        
Share-based compensation nonvested shares   280,000        
2015 Omnibus Incentive Plan | Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted in period (in shares)       70,000 111,281 390,352
Shares granted in period       $ 404,000 $ 909,000 $ 4,100,000
Share-based compensation expense   $ 622,000 $ 719,000      
Share-based compensation expense not yet recognized   $ 313,000        
Share-based compensation nonvested shares   47,330