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Description of Business - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Abstract] |  |  |  |  |
Date of incorporation |  |  |  | Mar. 13, 2014 |
Reverse stock split |  |  |  | 1-for-35 |
Reverse stock split, conversion ratio | 0.028571429 |  |  |  |
Cash | $ 3,331 | $ 7,425 |  | $ 7,425 |
Operating loss |  | 6,166 | $ 3,722 | 9,667 | $ 7,724
Accumulated deficit | $ 118,903 | 128,246 |  | 128,246 |
Revenue from the sale of products or services |  | $ 71 | $ 133 | $ 155 | $ 339

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