Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Contract Balances) (Details)

v3.21.2
Summary of Significant Accounting Policies (Contract Balances) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Accounting Policies [Abstract]            
Trade accounts receivable from customers $ 147,944   $ 74,774      
Short-term contract liabilities (deferred revenue) (250) $ (1,117) (946) $ (7) $ (2) $ (631)
Short-term contract liabilities (accounts payable) $ (699)   $ (914)