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Stock-Based Awards (Details) - shares
6 Months Ended 44 Months Ended
Jan. 01, 2022
Jun. 30, 2022
Jun. 30, 2021
Sep. 14, 2015
Dec. 31, 2021
Sep. 30, 2015
Stock-based awards            
Options granted (in shares)   1,891,950        
Options outstanding   5,014,953     3,792,450  
Stock Option Valuation            
Risk-free interest rate (as a percent)   1.90% 0.91%      
Expected term (in years)   6 years 2 months 12 days 6 years 2 months 12 days      
Expected volatility (as a percent)   77.95% 76.60%      
Expected dividend yield (as a percent)   0.00% 0.00%      
2017 Inducement Plan            
Stock-based awards            
Options outstanding   410,600        
2017 Inducement Plan | Restricted stock unit awards            
Stock-based awards            
Number of shares outstanding   2,375        
2015 Equity Incentive Plan            
Stock-based awards            
Number of shares authorized           1,643,872
Number of shares available for grant   3,372,766        
Percentage increase to shares available for grant from common outstanding as of preceding December 31 (as a percent)   4.00%        
Additional shares available 2,449,137          
Options outstanding   4,130,376        
2015 Equity Incentive Plan | Restricted stock unit awards            
Stock-based awards            
Number of shares outstanding   1,454,934        
2012 Equity Compensation Plan            
Stock-based awards            
Number of shares available for grant   0        
Options granted (in shares)       1,140,524    
Options outstanding   473,977        
Term of award (in years)   10 years