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Nature of Business, Basis of Presentation and Liquidity - Liquidity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Liquidity |  |  |  |  |
Accumulated deficit | $ 216,275 |  | $ 216,275 |  | $ 195,168
Net loss | 7,057 | $ 7,935 | 20,804 | $ 24,904 |
Net cash used in operating activities |  |  | (19,969) | $ (21,008) |
Cash and cash equivalents | $ 57,975 |  | $ 57,975 |  | $ 3,891
Minimum period to fund Operating expense |  |  | 12 months |  |

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- Definition Minimum period for Research and Development tax incentive to fund operating expense, 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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