Quarterly report pursuant to Section 13 or 15(d)

Revenue - Revenue from contracts with customers (Details)

v3.21.1
Revenue - Revenue from contracts with customers (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
customer
Mar. 31, 2020
USD ($)
Revenue    
Revenue $ 434 $ 761
Number of contracts with customers | customer 2  
Increase in deferred revenue $ 162 49,445
Development revenue    
Revenue    
Revenue $ 434 $ 761