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Current Liabilities and Debt Obligations, Subordinated Debt (Q2) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2015
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2015
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2015
Apr. 18, 2017
Subordinated Debt [Abstract]                      
Debt instrument, fixed interest rate               12.00%      
Interest expense, related party                 $ 292,000    
Gain on extinguishment of subordinated debt             $ 0 $ 0 1,031,000    
Porter [Member]                      
Subordinated Debt [Abstract]                      
Related party ownership percentage 35.00%     35.00%     35.00%        
Proceeds from related party, debt $ 2,500,000     $ 2,500,000              
Debt instrument, fixed interest rate 12.00%     12.00%     6.00%       6.00%
Debt instrument, first interest payment due date         Aug. 20, 2015         Aug. 20, 2015  
Debt instrument, last principal and interest payment date Jul. 01, 2017       Jul. 25, 2022   Jul. 25, 2022     Jul. 01, 2017  
Interest expense, related party   $ 88,000 $ 82,000   $ 175,000 $ 162,000 $ 330,000 $ 308,000 $ 292,000    
Accrued interest payable   $ 1,200,000     $ 1,200,000   1,100,000        
Gain on extinguishment of subordinated debt             $ 1,000,000