Quarterly report pursuant to Section 13 or 15(d)

Organization and Principal Activities - Additional Information (Details)

v3.22.2
Organization and Principal Activities - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
shares
Jun. 30, 2022
USD ($)
Segment
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Date of incorporation   Apr. 21, 2003    
Headquartered in   South San Francisco    
Headquartered in state   CA    
Number of operating segments | Segment   1    
Accumulated deficit $ 398,533 $ 398,533   $ 333,411
Unrestricted cash, cash equivalents and marketable securities $ 191,600 $ 191,600    
Substantial doubt about going concern, within one year   false    
Underwriting discounts and commissions and other offering expenses     $ 491  
At-the-Market (“ATM") | Common Stock        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Shares of common stock | shares 1,716,996      
Gross proceeds from issuance of common stock $ 8,900      
Underwriting discounts and commissions and other offering expenses 700      
Net proceeds from issuance of common stock $ 8,200      
Minimum        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Period from issuance date of unaudited interim condensed financial statements   12 months