Revenue, Future Fixed Payments from International Recurring Revenue Customers (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Remaining Performance Obligation [Abstract]
Future fixed payments from international recurring revenue customers	$ 324	$ 429
International [Member]
Remaining Performance Obligation [Abstract]
Future fixed payments from international recurring revenue customers	1,024
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 | International [Member]
Remaining Performance Obligation [Abstract]
Future fixed payments from international recurring revenue customers	$ 311
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 fixed payments from international recurring revenue customers	$ 233
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 fixed payments from international recurring revenue customers	$ 233
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 fixed payments from international recurring revenue customers	$ 180
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 fixed payments from international recurring revenue customers	$ 67
Expected timing of satisfaction period	1 year