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Commitments and Contingencies (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2017 USD ($) ft² | May 31, 2016 USD ($) ft² | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Operating lease, rent expense |  |  | $ 200 | $ 100 | $ 600 | $ 200
Menlo Park, California |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Operating lease, term of contract |  | 26 months |  |  |  |
Leased office space, square footage | ft² |  | 4,000 |  |  |  |
Operating lease, monthly expense |  | $ 20,000 |  |  |  |
Redwood City, California |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Operating lease, term of contract | 30 months |  |  |  |  |
Leased office space, square footage | ft² | 14,000 |  |  |  |  |
Operating lease, monthly expense | $ 55,000 |  |  |  |  |

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