Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Summary of significant accounting policies - Deferred Revenue, Remaining Performance Obligations and Cost of Revenue (Details)

v3.22.1
Summary of significant accounting policies - Deferred Revenue, Remaining Performance Obligations and Cost of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Recognized revenue $ 53,145 $ 40,942 $ 31,451
Remaining performance obligation $ 137,531    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Percent of revenue to be recognized   87.60%  
Period of revenue recognition   1 year  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Period of revenue recognition 1 year  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Period of revenue recognition    
Billed Revenues      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Remaining performance obligation $ 78,750    
Unbilled Revenues      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Remaining performance obligation $ 58,781