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Description of Business - Additional Information (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Feb. 01, 2021
USD ($)
Jan. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Description Of Business [Line Items]        
Date of incorporation     Mar. 13, 2014  
Class A common stock, par value | $ / shares     $ 0.001 $ 0.001
Reverse stock split     1-for-35  
Reverse stock split, conversion ratio     35  
Cash     $ 3,331 $ 5,459
Net loss     14,130 9,781
Accumulated deficit     118,903 104,773
Revenue from the sale of products or services     $ 661 $ 1,496
Subsequent Event        
Description Of Business [Line Items]        
Net proceeds from public offering $ 9,600      
Subsequent Event | March 2020 Offering        
Description Of Business [Line Items]        
Net proceeds from exercise of warrants issued   $ 1,300