Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Principles - Disaggregation of Revenue (Details)

v3.20.4
Summary of Significant Accounting Principles - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Total Revenue $ 50,706 $ 14,859 $ 22,256
GCI Holdings      
Disaggregation of Revenue [Line Items]      
Total Revenue 33,670    
GCI Holdings | Lease, grant, and revenue from subsidies      
Disaggregation of Revenue [Line Items]      
Total Revenue 2,718    
GCI Holdings | Consumer Revenue | Wireless      
Disaggregation of Revenue [Line Items]      
Total Revenue 4,724    
GCI Holdings | Consumer Revenue | Data      
Disaggregation of Revenue [Line Items]      
Total Revenue 7,222    
GCI Holdings | Consumer Revenue | Video      
Disaggregation of Revenue [Line Items]      
Total Revenue 2,689    
GCI Holdings | Consumer Revenue | Voice      
Disaggregation of Revenue [Line Items]      
Total Revenue 461    
GCI Holdings | Business Revenue | Wireless      
Disaggregation of Revenue [Line Items]      
Total Revenue 2,653    
GCI Holdings | Business Revenue | Data      
Disaggregation of Revenue [Line Items]      
Total Revenue 11,976    
GCI Holdings | Business Revenue | Video      
Disaggregation of Revenue [Line Items]      
Total Revenue 380    
GCI Holdings | Business Revenue | Voice      
Disaggregation of Revenue [Line Items]      
Total Revenue 847    
Skyhook      
Disaggregation of Revenue [Line Items]      
Total Revenue $ 17,036 $ 14,859