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Commitments and Contingencies - Future Cash Flows to be Received from Subleases (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Estimated future minimum sublease income [Abstract] |  |  |
2019 (excluding the three months ended March 31, 2019) |  | $ 1,668 |
2020 |  | 2,280 |
2021 |  | 1,906 |
2022 |  | 1,644 |
2023 |  | 556 |
Total minimum lease payments |  | $ 8,054 |
Estimated future minimum sublease income [Abstract] |  |  |
2019 | [1] |  | $ 2,249
2020 | [1] |  | 2,376
2021 | [1] |  | 2,006
2022 | [1] |  | 1,746
2023 | [1] |  | 592
Total minimum lease payments | [1] |  | $ 8,969
[1] | Sublease income as of December 31, 2018 includes base lease payments and expected reimbursement of certain operating expenses under executed sublease agreements.

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