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Restructuring - Narrative (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 02, 2020 | Dec. 17, 2019 | Jan. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring |  |  |  | $ (16) | $ (19) | $ (44) | $ 243 |  |  |  |  |  |
Proceeds from sale of common stock |  |  | $ 2,300 |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio | 0.2 |  |  |  |  | 0.2 |  |  |  |  |  |  |
Stockholders' equity |  |  |  | 2,139 | $ 5,240 | $ 2,139 | $ 5,240 | $ 1,714 | $ 5,883 | $ 3,996 | $ 6,152 | $ 8,433 | $ 11,052
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  | 0.5 |  |  |  |  |  |  |  |  |  |  |
Facility Closing | 2017 Restructuring Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring |  |  |  | $ 16 |  |  |  |  |  |  |  |  |

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