Revenue, Future Fixed Payments from International Recurring Revenue Customers (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 115	$ 324
International [Member]
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	3,244
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers		$ 209
Expected timing of satisfaction period		1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 108
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | International [Member]
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 948
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Remaining Performance Obligation [Abstract]
Expected timing of satisfaction period	1 year
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	$ 954
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Remaining Performance Obligation [Abstract]
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	$ 867
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Remaining Performance Obligation [Abstract]
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	$ 440
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	$ 35
Expected timing of satisfaction period	1 year