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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Net rent expense |  |  |  | $ 800 | $ 1,200 | $ 1,200
Capital leases |  |  |  | 20 |  |
Capital leases, accumulated depreciation |  |  |  | 4 |  |
Outstanding purchase commitment |  |  |  | $ 2,800 |  |
Scenario, forecast |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Purchase commitment | $ 800 | $ 1,500 | $ 500 |  |  |

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