XML 52 R41.htm IDEA: XBRL DOCUMENT v3.21.2
Revenue - Contract Assets and Liabilities (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 from Contract with Customer [Abstract]          
Contract assets $ 181   $ 181   $ 387
Contract liabilities 24,817   24,817   $ 18,020
Contract with Customer, Liability          
Revenue recognized in the period from amounts included in contract liability at the beginning of the period $ 8,815 $ 37 $ 13,942 $ 310