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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 Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Deferred revenue - current liabilities $ 10,767 $ 8,029  
Deferred revenue - noncurrent liabilities 77,887 82,217  
Accumulated deficit (156,151) (84,190) $ (85,187)
ASU 2014-09 | Adjustments      
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Deferred revenue - current liabilities 1,433 407  
Deferred revenue - noncurrent liabilities 888 590  
Accumulated deficit 2,321 (997)  
ASU 2014-09 | Balances without adoption of ASC 606      
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Deferred revenue - current liabilities 12,200 8,436  
Deferred revenue - noncurrent liabilities 78,775 82,807  
Accumulated deficit $ (153,830) $ (85,187)