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Revenue Recognition - Contract Balances (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Oct. 01, 2018
Sep. 30, 2018
Revenue from Contract with Customer [Abstract]      
Contract assets, current $ 772 $ 169  
Contract assets, non-current 507 507  
Contract liabilities, current 4,655 4,792 $ 4,792
Deferred revenue, non-current portion $ 407 $ 485 $ 485