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Summary of Significant Accounting Policies - Schedule of Changes in Contract Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]    
Deferred revenue January 1 $ 797 $ 655
Unearned billings 3,163 2,684
Revenue recognized (2,828) (2,542)
Deferred revenue December 31 $ 1,132 $ 797