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Revenue and Contract Acquisition Costs - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenue from Contract with Customer [Abstract]        
Revenue recognized $ 100,000 $ 600,000 $ 1,100,000 $ 2,500,000
Revenue recognized from performance obligations satisfied in previous periods 0 0 0 0
Amortization of capitalized commission costs $ 2,300,000 $ (1,800,000) $ (6,400,000) $ (5,000,000.0)