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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) |

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