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Revenue Recognition, Future Undiscounted Fixed Payments from International Recurring Revenue Customers (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
Remaining Performance Obligation [Abstract]  
Future undiscounted fixed payments from international recurring revenue customers $ 1,549
International [Member]  
Remaining Performance Obligation [Abstract]  
Future undiscounted fixed payments from international recurring revenue customers 4,863
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01  
Remaining Performance Obligation [Abstract]  
Future undiscounted fixed payments from international recurring revenue customers $ 1,148
Expected timing of satisfaction period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01 | International [Member]  
Remaining Performance Obligation [Abstract]  
Future undiscounted fixed payments from international recurring revenue customers $ 390
Expected timing of satisfaction period 3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | International [Member]  
Remaining Performance Obligation [Abstract]  
Future undiscounted fixed payments from international recurring revenue customers $ 1,556
Expected timing of satisfaction period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 | International [Member]  
Remaining Performance Obligation [Abstract]  
Future undiscounted fixed payments from international recurring revenue customers $ 1,479
Expected timing of satisfaction period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | International [Member]  
Remaining Performance Obligation [Abstract]  
Future undiscounted fixed payments from international recurring revenue customers $ 1,076
Expected timing of satisfaction period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | International [Member]  
Remaining Performance Obligation [Abstract]  
Future undiscounted fixed payments from international recurring revenue customers $ 362
Expected timing of satisfaction period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | International [Member]  
Remaining Performance Obligation [Abstract]  
Future undiscounted fixed payments from international recurring revenue customers $ 0
Expected timing of satisfaction period