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Description of Business - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 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 $ 4,700   $ 4,700  
Operating loss   4,373 $ 3,660 14,040 $ 11,384
Accumulated deficit $ 118,903 132,933   132,933  
Revenue from the sale of products or services   $ 109 $ 131 $ 264 $ 470