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Stockholders' Equity - (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Common stock reserved      
Dividends on common stock   $ 0.00  
Reserved shares of common stock for future issuance   2,918,202 2,809,928
Common stock warrants      
Common stock reserved      
Reserved shares of common stock for future issuance   49,336 27,836
Options issued and outstanding      
Common stock reserved      
Reserved shares of common stock for future issuance   2,272,905 1,931,903
Shares available for future option grants      
Common stock reserved      
Reserved shares of common stock for future issuance   179,219 638,227
RSUs subject to future vesting      
Common stock reserved      
Reserved shares of common stock for future issuance   416,742 211,962
At-the-Market Sales Agreement      
Common stock reserved      
Maximum amount of shares for offering $ 25.0    
Maximum commission percentage 3.00%    
Net proceeds $ 2.1    
Number of shares sold 468,427