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Restructuring - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) position | Mar. 31, 2019 USD ($) position | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Restructuring and Related Activities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ 65 | $ (1,165) | $ (4,340) | $ (541) | $ (1,308) | $ (946) | $ (2,254) | $ (2,865) | $ (5,981) | $ (7,373) |
Net cash used in operating activities |  |  |  |  |  |  |  |  |  | (2,451) | (6,624) |
Loss on impairment |  |  |  |  |  |  |  |  |  |  | 200 |
Number of positions eliminated | position |  |  |  |  |  |  |  | 9 | 3 |  |  |
Net sales |  | 3,746 | $ 5,964 | 3,335 | $ 3,783 | $ 3,531 | $ 2,915 | $ 3,082 | $ 3,177 | 16,828 | 12,705 |
Change in revenue, percent |  |  |  |  |  | 21.10% |  |  |  |  |  |
Restructuring |  |  |  |  |  |  |  |  |  | (60) | 196 |
Net proceeds from sale of common stock | $ 2,300 |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  | $ 4,255 |  | $ 1,714 |  | $ 3,996 |  |  |  | 4,255 | $ 3,996 | $ 11,052
Warrant liability - modification |  |  |  |  |  |  |  |  |  | $ 1,405 |  |

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