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Organization - Narrative (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) segment product | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Number of therapy products | product | 2 |  |  |
Number of reportable segments | segment | 1 |  |  |
Accumulated deficit | $ 383,384 |  | $ 378,679 |
Net loss | 4,705 | $ 2,844 |  |
Cash, cash equivalents, and restricted cash | 45,712 | $ 35,084 | 26,978 | $ 18,286
Cash and cash equivalents | 45,623 |  | $ 26,889 |
Short term investments | $ 37,700 |  |  |

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