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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 | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred revenue | $ 7,129 | $ 8,029 | $ 8,436
Deferred revenue—noncurrent | 79,245 | 82,217 | 82,807
Accumulated deficit | (135,409) | (84,190) | (85,187)
Other current assets | 2,474 |  | $ 3,046
ASU 2014-09 | Adjustments |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred revenue | 1,148 | 407 |
Deferred revenue—noncurrent | 980 | 590 |
Accumulated deficit | 2,100 | (997) |
Other current assets | (28) |  |
ASU 2014-09 | Balances without adoption of ASC 606 |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred revenue | 8,277 | 8,436 |
Deferred revenue—noncurrent | 80,225 | 82,807 |
Accumulated deficit | (133,309) | $ (85,187) |
Other current assets | $ 2,446 |  |

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