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Liabilities - Performance Obligations Timing (Details)
6 Months Ended
Jun. 30, 2021
Liabilities  
Revenue, Practical Expedient, Remaining Performance Obligation true
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01  
Performance obligations  
Remaining performance obligations, expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01  
Performance obligations  
Remaining performance obligations, expected timing of satisfaction 2 years