Stockholders' Equity - Additional Information (Detail) - USD ($)
 1 Months Ended 9 Months Ended 12 Months Ended
Dec. 28, 2020
Dec. 31, 2020
Oct. 31, 2019
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Subsidiary Sale Of Stock [Line Items]              
Common stock, shares authorized   300,000,000     300,000,000 300,000,000  
Preferred stock, shares authorized   10,000,000     10,000,000 10,000,000  
Preferred stock, par value   $ 0.0001     $ 0.0001 $ 0.0001  
Preferred stock, shares issued   0     0 0  
Preferred stock, shares outstanding   0     0 0  
Common stock, shares issued   47,552,693     69,047,878 47,552,693  
Common stock, shares outstanding   47,552,693     69,047,878 47,552,693  
Common stock voting rights         Holders of the Company’s common stock are entitled to one vote per share.    
Common stock, preferred stock, debt securities, warrants and units covered in Registration Statement     $ 250,000,000.0        
Percentage of gross proceeds as underwriter compensation     3.00%        
Maximum offering expense agreed to be reimbursed     $ 50,000        
Issuance of pre-funded warrants, net of issuance costs   $ 87,700,000       $ 87,704,000  
Warrant exercise price         $ 0.01    
Warrants cancelled         4,872    
Warrants exercised         10,459,576    
Warrants outstanding           0  
Warrants and Rights outstanding   $ 0       $ 0  
Amended and Restated Certificate of Incorporation [Member]              
Subsidiary Sale Of Stock [Line Items]              
Common stock, shares authorized         300,000,000    
Preferred stock, shares authorized         10,000,000    
Preferred stock, par value         $ 0.0001    
ATM Equity Offering Program [Member]              
Subsidiary Sale Of Stock [Line Items]              
Stock Issued During Period Shares New Issues         3,990,869 1,160,193  
Net proceeds from issuance of stock         $ 36,719,000 $ 9,770,000 $ 4,064,000
ATM Equity Offering Program [Member] | Maximum [Member]              
Subsidiary Sale Of Stock [Line Items]              
Net proceeds from issuance of stock     $ 75,000,000.0        
Common Stock [Member] | ATM Equity Offering Program [Member]              
Subsidiary Sale Of Stock [Line Items]              
Stock Issued During Period Shares New Issues         3,990,869 1,160,963 490,880
Net proceeds from issuance of stock         $ 36,600,000    
Common Stock [Member] | Private Investment in Public Equity [Member]              
Subsidiary Sale Of Stock [Line Items]              
Shares issued price per share       $ 11.00      
Stock Issued During Period Shares New Issues       5,000,000 5,000,000 9,586,478  
Net proceeds from issuance of stock       $ 52,700,000      
Common Stock and Warrants [Member] | Private Investment in Public Equity [Member]              
Subsidiary Sale Of Stock [Line Items]              
Shares issued price per share $ 3.71 $ 3.34       $ 3.34  
Stock Issued During Period Shares New Issues 4,043,127            
Proceed from issuance of stock and pre-funded warrants   $ 119,800,000          
Sale of common stock   5,543,351          
Warrant exercise price   $ 0.01       0.01  
Offering price per share   3.34       3.34  
Offering price per share, prepaid by purchaser   $ 3.33       $ 3.33  
Warrants to purchase shares of common stock   27,480,719          
Placement agent commissions and legal fees   $ 5,700,000          
Maximum percentage of common stock ownership to exercise warrant         9.99%