Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

v3.21.1
Summary of Significant Accounting Policies - Narrative (Details)
1 Months Ended 12 Months Ended
Jul. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
consumer
Dec. 31, 2019
USD ($)
Jan. 01, 2021
USD ($)
Jul. 15, 2020
USD ($)
Product Information [Line Items]            
Number of customers per impressions | consumer     1,000      
Cash equivalents     $ 0 $ 0    
Restricted cash     91,000 86,000    
Property and equipment, net     13,000 24,000    
Depreciation     $ 11,000 $ 59,000    
Forecast | Accounting Standards Update 2016-02            
Product Information [Line Items]            
Operating lease, liability         $ 2,100,000  
Right-of-use asset         $ 1,900,000  
Senior Convertible Note            
Product Information [Line Items]            
Interest rate of notes (as a percent)   7.00%        
Principal amount of note   $ 3,000,000        
Proceeds from debt, net of issuance costs   2,371,000        
Estimated net cash proceeds   $ 2,760,000        
Convertible notes            
Product Information [Line Items]            
Interest rate of notes (as a percent)     7.00%     7.00%
Estimated net cash proceeds $ 1,751,000          
Convertible notes | Series A Note            
Product Information [Line Items]            
Principal amount of note $ 4,320,000         $ 4,320,000
Minimum            
Product Information [Line Items]            
Term of license subscription agreement (in months)     1 year      
Property and equipment, useful life (in years)     three      
Maximum            
Product Information [Line Items]            
Term of license subscription agreement (in months)     3 years      
Property and equipment, useful life (in years)     seven years