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Segment Reporting - Concentration Percentage (Details) - Customer Concentration Risk
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Customer A | Oblong (formerly Glowpoint) | Revenue        
Concentration Risk [Line Items]        
Concentration risk, percentage 32.00% 23.00% 34.00% 15.00%
Customer A | Oblong Industries | Accounts Receivable        
Concentration Risk [Line Items]        
Concentration risk, percentage     22.00% 32.00%
Customer B | Oblong Industries | Revenue        
Concentration Risk [Line Items]        
Concentration risk, percentage 0.00% 20.00% 0.00% 21.00%
Customer B | Oblong Industries | Accounts Receivable        
Concentration Risk [Line Items]        
Concentration risk, percentage     13.00% 10.00%
Customer C | Oblong Industries | Accounts Receivable        
Concentration Risk [Line Items]        
Concentration risk, percentage     0.00% 12.00%