Quarterly report pursuant to Section 13 or 15(d)

Organization and Description of Business - Additional Information (Detail)

v3.21.2
Organization and Description of Business - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Nov. 30, 2021
USD ($)
Jul. 30, 2021
USD ($)
Installments
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
segment
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Class of Stock [Line Items]                      
Number of operating segments | segment                 1    
Net loss     $ 22,682 $ 23,222 $ 17,551 $ 11,421 $ 10,726 $ 13,088 $ 63,455 $ 35,235  
Cash flows from operating activities                 (55,188) $ (29,909)  
Accumulated deficit     (740,313)           (740,313)   $ (676,858)
Cash and cash equivalents and marketable securities     113,800           113,800    
Line of credit optional amount of borrowing capacity   $ 25,000                  
ABW Cyclops SPV LP [Member]                      
Class of Stock [Line Items]                      
Proceeds from Lines of Credit   $ 75,000                  
Number of funding installments | Installments   3                  
Line of credit optional amount of borrowing capacity   $ 25,000                  
Costs Incurred, Development Costs   $ 100,000                  
ABW Cyclops SPV LP [Member] | Financing Agreement Funding Installments One [Member]                      
Class of Stock [Line Items]                      
Proceeds from Lines of Credit     25,000                
Subsequent Event [Member] | ABW Cyclops SPV LP [Member] | Financing Agreement Funding Installments Two [Member]                      
Class of Stock [Line Items]                      
Proceeds from Lines of Credit $ 25,000                    
ATM Offering [Member]                      
Class of Stock [Line Items]                      
Net loss     22,700           63,500    
Cash flows from operating activities                 55,200    
Accumulated deficit     $ 740,300           $ 740,300