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Commitments and Contingencies - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) agreement letter | Dec. 31, 2017 USD ($) letter | Dec. 31, 2016 USD ($)
Commitment And Contingencies [Line Items] |  |  |
Number of non-cancellable operating lease agreements | agreement | 4 |  |
Total | $ 27,939 |  |
2019 | 3,569 |  |
2020 | 4,683 |  |
2021 | 4,914 |  |
2022 | 5,052 |  |
2023 | 5,194 |  |
Rent expense | $ 4,200 | $ 3,700 | $ 3,600
Letters of credit (in letter) | letter | 3 | 2 |
Letters of credit outstanding, amount | $ 800 | $ 800 |
Accrued settlement costs |  |  | 1,100
Office Space in San Francisco |  |  |
Commitment And Contingencies [Line Items] |  |  |
Sublease income |  | $ 900 | $ 900
Total | 15,700 |  |
Office Space in San Francisco | Minimum |  |  |
Commitment And Contingencies [Line Items] |  |  |
2019 | 1,000 |  |
2020 | 1,000 |  |
2021 | 1,000 |  |
2022 | 1,000 |  |
2023 | 1,000 |  |
2024 | 1,000 |  |
Office Space in San Francisco | Maximum |  |  |
Commitment And Contingencies [Line Items] |  |  |
2019 | 2,200 |  |
2020 | 2,200 |  |
2021 | 2,200 |  |
2022 | 2,200 |  |
2023 | 2,200 |  |
2024 | 2,200 |  |
Office Space in Chicago |  |  |
Commitment And Contingencies [Line Items] |  |  |
Total | 10,300 |  |
Office Space in Chicago | Minimum |  |  |
Commitment And Contingencies [Line Items] |  |  |
2019 | 500 |  |
2020 | 500 |  |
2021 | 500 |  |
2022 | 500 |  |
2023 | 500 |  |
2024 | 500 |  |
Office Space in Chicago | Maximum |  |  |
Commitment And Contingencies [Line Items] |  |  |
2019 | 2,000 |  |
2020 | 2,000 |  |
2021 | 2,000 |  |
2022 | 2,000 |  |
2023 | 2,000 |  |
2024 | $ 2,000 |  |

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