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Stock Based Compensation - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 01, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 19, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of stock options outstanding (in shares)   215,345   215,345   215,345   118,003
Number of options granted (in shares)           107,845    
Stock option compensation expense   $ 0 $ 23,000 $ 6,000 $ 50,000      
Options, intrinsic value, vested   0   0        
Unrecognized stock-based compensation expense for stock options   $ 0   0        
Stock-based compensation, tax benefit       0   $ 0    
Compensation costs capitalized as part of the cost of an asset       $ 0   $ 0    
Weighted average period for amortization of unrecognized stock-based compensation       7 months 13 days        
Stock options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of options granted (in shares)       0   0    
Restricted stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unvested restricted shares outstanding (in shares)   627   627   627   11,320
Stock option compensation expense   $ 0 1,000 $ 0 3,000      
Vesting period       10 years        
Award service period       5 years        
Unrecognized stock-based compensation expense for other than options   $ 0   $ 0        
Granted, restricted shares (in shares)           0    
Forfeited, restricted shares (in shares)           9,321    
RSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unvested restricted shares outstanding (in shares)   0   0   23,334   503,518
Stock-based compensation arrangement, vested in period, remain outstanding (in shares)       28,904        
Unrecognized stock-based compensation expense for other than options   $ 0   $ 0        
Granted, restricted shares (in shares)           55,479    
Forfeited, restricted shares (in shares)           421,158    
Prior plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares available for grant (in shares)             421,000  
2019 Equity incentive plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares available for grant (in shares)   3,021,000   3,021,000        
Awards granted in period (in shares)       0        
2019 Equity incentive plan | Stock options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares available for grant (in shares)   2,600,000   2,600,000        
2007 Stock incentive plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares available for grant (in shares)   0   0        
2007 Stock incentive plan | Stock options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of stock options outstanding (in shares)   107,500   107,500        
2007 Stock incentive plan | Restricted stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unvested restricted shares outstanding (in shares)   627   627        
Nonemployee | Stock options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares available for grant (in shares) 107,845              
Weighted average price of shares (in dollars per share) $ 4.92              
Exercise period 1 year              
Stock option compensation expense           $ 0    
Series D Preferred Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock option compensation expense   $ 29,000 0 $ 55,000 $ 0      
Series D Preferred Stock | Restricted stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unvested restricted shares outstanding (in shares)   16,437   16,437        
Stock option compensation expense   $ 29,000 $ 55,000          
Vesting period 2 years              
Unrecognized stock-based compensation expense for other than options   $ 97,000   $ 97,000        
Issuance of restricted stock (in shares) 49,967     49,967        
Forfeited, restricted shares (in shares)   17,364   31,805