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Debt - Narrative (Details) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 30 Months Ended
Apr. 17, 2020
Jan. 16, 2020
Nov. 29, 2019
Nov. 25, 2019
Mar. 29, 2019
Jan. 31, 2020
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2021
Dec. 31, 2019
Line of Credit Facility [Line Items]                          
Credit line borrowings, net of loan origination fees             $ 1,331,000 $ 1,331,000   $ 1,331,000     $ 715,000
Accumulated interest on subordinated debt   $ 100,000                      
Preferred stock, par value (in usd per share)             $ 0.0001 $ 0.0001   $ 0.0001     $ 0.0001
Percentage of gross proceeds used to make payments on note           10.00%              
Gross proceeds           $ 275,000              
Payments on the Iliad Note                   $ 526,000 $ 0    
PPP loan             $ 263,000 $ 263,000   263,000     $ 0
PPP loan, net of current maturities             532,000 532,000   532,000     0
Note Purchase Agreement                          
Line of Credit Facility [Line Items]                          
Borrowing rate       8.00%                  
Principal amount       $ 1,300,000                  
Unamortized issuance costs at date of issuance             200,000 200,000   200,000     200,000
Issue discount       142,000                  
Purchase price       1,100,000                  
Unamortized debt issuance costs       15,000                  
Prepayment premium     15.00%                    
Repurchase amount (up to)       $ 150,000                  
Percentage increase due to deferral of redemption option     1.50%                    
Total liability, net of discount and financing fees             600,000 $ 600,000   $ 600,000     1,000,000.0
Increase in amount outstanding from becoming delisted     15.00%                    
Percentage of gross proceeds used to make payments on note     10.00%                    
Increase from exercises of restricted issuance     3.00%                    
Payments on the Iliad Note           $ 226,000              
Increase in amount outstanding from insolvency and bankruptcy event     5.00%                    
Interest rate after insolvency and bankruptcy events     22.00%                    
Note Purchase Agreement | Minimum                          
Line of Credit Facility [Line Items]                          
Increase in amount outstanding from default event     5.00%                    
Note Purchase Agreement | Maximum                          
Line of Credit Facility [Line Items]                          
Increase in amount outstanding from default event     15.00%                    
Note Purchase Agreement | Debt Instrument, Period Two                          
Line of Credit Facility [Line Items]                          
Prepayment premium     10.00%                    
Paycheck Protection Program                          
Line of Credit Facility [Line Items]                          
Borrowing rate 1.00%                        
Proceeds from loan origination $ 795,000                        
Accrued interest             $ 2,000            
Subsequent Event                          
Line of Credit Facility [Line Items]                          
Interest rate on convertible notes                       10.00%  
Convertible Debt                          
Line of Credit Facility [Line Items]                          
Proceeds from issuance of subordinated convertible promissory notes         $ 1,700,000                
Principal amount                 $ 1,700,000   $ 1,700,000    
Interest rate on convertible notes                 5.00%        
Unamortized issuance costs at date of issuance   40,000.00                      
Net proceeds from the conversion of convertible debt to preferred stock   $ 1,800,000                      
Conversion rate (in dollars per share)   $ 0.67             $ 0.67   $ 0.67    
Conversion of notes to preferred stock (in shares)                   2,709,018      
Preferred stock, par value (in usd per share)             $ 0.0001 $ 0.0001   $ 0.0001      
Revolving Credit Facility                          
Line of Credit Facility [Line Items]                          
Credit line borrowings, net of loan origination fees             $ 1,300,000 $ 1,300,000   $ 1,300,000     700,000
Unamortized issuance costs             $ 100,000 $ 100,000   $ 100,000     $ 100,000
Debt instrument, variable rate               2.00%          
Borrowing rate             5.25% 5.25%   5.25%     6.75%
Overdraft fee               2.00%          
Annual facility fee             1.00% 1.00%   1.00%      
Maximum borrowing capacity on line of credit             $ 5,000,000.0 $ 5,000,000.0   $ 5,000,000.0      
Debt instrument, term               3 years          
Collateral management fee               0.50%