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Revenue from Contracts with Customers - Assets and Liabilities Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]    
Revenue recognized that was included in contract liabilities at beginning of period $ 574 $ 1,305
Increase in contract liabilities due to cash received, excluding amounts recognized as revenue (500) (661)
Transferred to receivables from contract assets at beginning of period $ 0 $ 0