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Current Accrued Expenses - Schedule of Current Accrued Expenses (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Clinical trial expenses | $ 4,289 | $ 4,530 | $ 869
Compensation, excluding taxes | 3,469 | 1,785 | 1,124
Professional fees |  | 190 | 221
Short-term portion of lease restructuring |  | 184 | 209
Other | 630 | 1,247 | 985
Total accrued expenses | $ 9,119 | 7,964 | $ 3,408
Scenario, Previously Reported [Member] |  |  |
Other |  | $ 1,275 |

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