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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) |

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