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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
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Net loss $ (51,219) $ (20,838)
Changes in prepaid expenses 648 (3,190)
Changes in deferred revenue (3,872) $ (2,629)
ASU 2014-09 | Adjustments    
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Net loss (1,103)  
Changes in prepaid expenses (28)  
Changes in deferred revenue 1,131  
ASU 2014-09 | Balances without adoption of ASC 606    
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Net loss (52,322)  
Changes in prepaid expenses 620  
Changes in deferred revenue $ (2,741)