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Revenues (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Performance obligations satisfied or partially satisfied in previous periods $ 11,500 $ 2,600 $ 23,000 $ 15,100  
Unfulfilled performance obligations         $ 8,500
Contract asset 1,300   1,300   2,600
Contract liability 0   0   $ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Unfulfilled performance obligations $ 4,100   $ 4,100    
Performance obligation expected duration 24 months   24 months