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Organization (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 36 Months Ended
Mar. 24, 2022
Mar. 14, 2022
Sep. 16, 2021
Sep. 15, 2021
Jul. 01, 2019
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Dec. 31, 2021
Organization                  
Proceeds from public offering, net of underwriters' discounts             $ 14,615    
Cash and cash equivalents           $ 85,269   $ 85,269 $ 106,124
Expected period of sufficient funds for planned operations           12 months      
Proceeds from issuance of term loan           $ 10,000      
ATM Offering                  
Organization                  
Number of common stock shares newly issued             3,629,458 5,120,940  
Public offering price of the shares sold           $ 3.99   $ 3.99  
Proceeds from public offering, net of underwriters' discounts             $ 14,500 $ 20,400  
Threshold shares agreed to be sold         $ 50,000        
Sales commission percentage         3.00%        
2021 ATM Offering                  
Organization                  
Number of common stock shares newly issued           0      
Threshold shares agreed to be sold     $ 50,000            
Sales commission percentage     3.00%            
2022 ATM Offering                  
Organization                  
Number of common stock shares newly issued           0      
Threshold shares agreed to be sold $ 75,000                
Sales commission percentage 3.00%                
Loan agreement                  
Organization                  
Maximum borrowing capacity       $ 50,000          
First Tranche Term Loan                  
Organization                  
Proceeds from issuance of term loan       15,000          
Principal amount       $ 15,000          
Second Tranche Term Loan                  
Organization                  
Proceeds from issuance of term loan   $ 10,000              
Principal amount   $ 10,000