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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) |

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