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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