Quarterly report pursuant to Section 13 or 15(d)

Revenue - Revenue from contracts with customers (Details)

v3.21.2
Revenue - Revenue from contracts with customers (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
customer
Sep. 30, 2020
USD ($)
Revenue        
Revenue $ 1,203 $ 1,193 $ 4,732 $ 2,456
Number of contracts with customers | customer     2  
Development revenue        
Revenue        
Revenue $ 1,203 $ 1,193 $ 4,732 $ 2,456