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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Nov. 05, 2018
Jul. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Oct. 31, 2018
Jun. 30, 2020
Jun. 30, 2019
Mar. 18, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of common stock approved and reserved for issuance     7,104,450     7,104,450     4,979,255
Common Stock | Founder                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock issued for services         1,187,500        
Stock Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of common stock approved and reserved for issuance     4,921,326     4,921,326     3,366,812
Expected dividend yield     0.00% 0.00%   0.00% 0.00%    
Total unrecognized stock-based compensation related to unvested stock option awards granted     $ 36.3     $ 36.3      
Unrecognized stock-based compensation related to unvested stock, expected to recognize over weighted-average period           3 years 1 month 6 days      
Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Unrecognized stock-based compensation related to unvested stock, expected to recognize over weighted-average period           2 years 4 months 24 days      
Share vested     33,398 33,398   66,796 68,554    
Total unrecognized compensation expense related to unvested restricted stock     $ 0.9     $ 0.9      
Restricted Stock | Founder                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Measurement date fair value for stock issued for services $ 2.936                
Restricted Stock | Common Stock | Founder                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock issued for services 562,500                
Total compensation cost $ 1.7                
Vesting period 4 years                
2019 Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of common stock approved and reserved for issuance   1,401,443 965,725     965,725      
Equity incentive plans, description   A total of 1,401,443 shares of common stock were approved to be initially reserved for issuance under the 2019 Plan, including 101,443 shares that remained available for issuance under the 2018 Plan as of July 17, 2019. Shares subject to outstanding awards under the 2018 Plan as of the effective date of the 2019 Plan that are subsequently canceled, forfeited or repurchased by the Company will be added to the shares reserved under the 2019 Plan. In addition, the number of shares of common stock available for issuance under the 2019 Plan will be automatically increased on the first day of each calendar year during the ten-year term of the 2019 Plan, beginning with January 1, 2020 and ending with January 1, 2029, by an amount equal to 5% of the outstanding number of shares of the Company’s common stock on December 31st of the preceding calendar year or such lesser amount as determined by the Company’s board of directors. As of June 30, 2020, 965,725 shares of common stock were available for issuance under the 2019 Plan.              
Shares of common stock expiration term   10 years              
Shares of common stock beginning date   Jan. 01, 2020              
Shares of common stock ending date   Jan. 01, 2029              
Percentage of annual increase in common stock available for issuance   5.00%              
2018 Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of common stock approved and reserved for issuance   101,443              
2020 Inducement Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of common stock for future issuance               750,000  
Common stock available for issuance           487,500      
2019 Employee Stock Purchase Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of common stock approved and reserved for issuance     729,899     729,899      
Equity incentive plans, description           A total of 500,000 shares of common stock were approved to be initially reserved for issuance under the ESPP. In addition, the number of shares of common stock available for issuance under the ESPP will be automatically increased on the first day of each calendar year during the first ten-years of the term of the ESPP, beginning with January 1, 2020 and ending with January 1, 2029, by an amount equal to the lessor of (i) 1% of the outstanding number of shares of common stock on December 31st of the preceding calendar year, (ii) 1,500,000 shares of common stock or (iii) such lesser amount as determined by the Company’s board of directors. As of June 30, 2020, no shares were issued under the ESPP and there were 729,899 shares available for future issuance.      
Shares of common stock expiration term   10 years              
Shares of common stock beginning date   Jan. 01, 2020              
Shares of common stock ending date   Jan. 01, 2029              
Percentage of annual increase in common stock available for issuance   1.00%              
Stock issued for services   500,000       0      
Annual increase in common stock available for issuance, shares   1,500,000