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Revenue from Contracts with Customers - Contract Balances (Details) - USD ($)
6 Months Ended
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Contract with Customer [Line Items]      
Contract assets $ 2,648,000 $ 7,120,000 $ 0
Revenue recognized from deferred revenue 2,800,000    
Amount of contract assets reclassified to receivables 7,100,000    
Capitalized contract costs 1,200,000    
Impairment 0    
Satisfied in Previous Period      
Contract with Customer [Line Items]      
Revenue recognized from deferred revenue 0    
Other long-term liabilities      
Contract with Customer [Line Items]      
Deferred revenue, included in other long-term liabilities $ 454,000 $ 341,000