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Organization - Public Offerings (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Nov. 08, 2019
Apr. 26, 2016
Mar. 29, 2016
Sep. 30, 2021
Feb. 28, 2021
Mar. 31, 2018
Sep. 30, 2021
Sep. 30, 2022
Dec. 31, 2021
Public Offerings                  
Proceeds from sale of stock             $ 31,989    
Accumulated deficit               $ 297,872 $ 266,381
Cash, cash equivalents and short-term marketable securities               $ 49,600  
Common stock, par value (in dollars per share)               $ 0.0001 $ 0.0001
Exchange warrants issued       1,458,000     1,458,000    
Exchange Warrants                  
Public Offerings                  
Issuance of common stock (in shares) 1,458,000                
Common stock, par value (in dollars per share) $ 0.0001                
Exchange warrants issued 1,458,000                
Warrant exercise price $ 0.0001                
Issuance of shares exercised       1,457,947          
Follow On Public Offering                  
Public Offerings                  
Share offering price         $ 3.50 $ 8.50      
Proceeds from sale of stock         $ 32,000 $ 64,900      
Issuance of common stock (in shares)         9,783,660 8,117,647      
Over-Allotment Option                  
Public Offerings                  
Share offering price   $ 15.00              
Issuance of common stock (in shares)   502,618     1,212,231 1,058,823      
IPO                  
Public Offerings                  
Share offering price     $ 15.00            
Net proceeds from IPO   $ 70,600              
Issuance of common stock (in shares)     4,700,000