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Revenue Recognition - Schedule of Changes in Contract Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]    
Unearned revenue, Beginning balance $ 1,206 $ 797
Unearned billings 671 2,408
Revenue recognized (729) (2,057)
Unearned revenue, Ending balance $ 1,148 $ 1,148