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Description of Business and Summary of Significant Accounting Policies - Summary of Impact of Adopting Topic 606 on Condensed Financial Statements - Condensed Consolidated Statement of of Cash Flows (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Net loss $ (71,961) $ (30,594)
Changes in deferred revenue (1,592) $ 1,296
ASU 2014-09 | Adjustments    
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Net loss (1,324)  
Changes in deferred revenue 1,324  
ASU 2014-09 | Balances without adoption of ASC 606    
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Net loss (73,285)  
Changes in deferred revenue $ (268)