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Debt - Promissory Notes (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 23, 2020
Jul. 23, 2020
Dec. 19, 2019
Mar. 14, 2017
Dec. 31, 2020
Oct. 31, 2020
Jul. 31, 2020
Apr. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Nov. 01, 2018
Debt                      
Amount borrowed     $ 3,000                
Interest rate (stated)     3.00%                
Long term debt current         $ 4,746       $ 4,746 $ 20,461  
Warrants issued on conversion     403,101                
Interest rate on the event of default     25.00%                
Proceeds from debt issuance, net of fees     $ 3,000           66,190 31,300  
Amount outstanding         47,983       47,983 49,461  
Loans assumed   $ 398                  
Variable interest rate   1.00%                  
Loss on extinguishment of debt                 5,748 (483)  
Loan Proceeds Remain outstanding, Termination of Merger [Member]                      
Debt                      
Amount borrowed                     $ 1,100
Interest rate (stated)                     2.55%
Amount outstanding $ 1,077                 1,059  
Unpaid interest 4                    
Loan Proceeds Remain outstanding, Acceleration of Loan Due To Event of Default, Termination of Merger [Member]                      
Debt                      
Interest rate on the event of default       6.00%              
Proceeds from debt issuance, net of fees       $ 185              
Amount outstanding 185                 185  
Loss on extinguishment of debt 0                    
Unpaid interest 75                    
Paycheck Protection Program, Cares Act Loans [Member]                      
Debt                      
Interest rate (stated)               1.00%      
Proceeds from debt issuance, net of fees               $ 8,139      
Debt instrument term               2 years      
Amount outstanding         $ 8,139       8,139    
Twenty Twenty Promissory Notes [Member]                      
Debt                      
Variable interest rate         12.00%            
Repayments of debt 10,000                    
Repayment of loan 12,063                    
Adjustments to additional 564                    
Convertible debt with conversion feature 5,772                    
Loss on extinguishment of debt 5,047                    
Unpaid interest 2,000                    
Interest amount 63                    
Loan Agreement With Cantor Fitzgerald Securities [Member]                      
Debt                      
Proceeds from debt issuance, net of fees           $ 5,000 $ 10,000        
Restricted cash           $ 5,000          
Series C Redeemable Convertible Preferred Stock                      
Debt                      
Warrants grant date fair value         $ 300       300    
Amount outstanding                   $ 37  
Repayments of debt 3,381                    
Repayment of loan 4,424                    
Loss on extinguishment of debt                 $ 2,532    
Unpaid interest 1,000                    
Interest amount $ 43                    
Series C Redeemable Convertible Preferred Stock | Twenty Twenty Promissory Notes [Member]                      
Debt                      
Amount borrowed             $ 1,000        
Warrants issued on conversion             51,502        
Debt instrument term             1 year