XML 62 R51.htm IDEA: XBRL DOCUMENT v3.20.2
Revenue Recognition (Details 2) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Revenue Recognition [Abstract]    
Contract liability, beginning $ 13,426 $ 1,137
Recognition of revenue included in the beginning of year contract liability (12,971) (510)
Additions during the period, net of revenue recognized during the period 379 153
Contract liability, end $ 834 $ 780