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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Dec. 18, 2020
shares
Sep. 14, 2020
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Segment
$ / shares
shares
Sep. 30, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Mar. 31, 2020
shares
Dec. 31, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]                  
Net loss | $     $ (9,817,000) $ (6,144,000) $ (25,700,000) $ (16,907,000)      
Cash and cash equivalents | $     94,041,000 $ 114,464,000 94,041,000 $ 114,464,000 $ 114,195,000   $ 8,791,000
Working capital | $     91,500,000   91,500,000        
Accumulated deficit | $     (106,093,000)   $ (106,093,000)   (80,393,000)    
Cash, cash equivalents and restricted cash, maturity period         three months or less        
Cash equivalents | $     $ 9,200,000   $ 9,200,000   $ 9,200,000    
Number of operating business segments | Segment         1        
Warrants exercise price | $ / shares     $ 0.001   $ 0.001        
Antidilutive securities excluded from computation of earnings per share, amount         674,295 1,828,531      
2014 Stock Incentive Plan [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Increase in number of shares of common stock authorized for issuance               28,816  
Common stock, number of shares reserved for issuance             0    
2014 Employee Stock Purchase Plan [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Increase in number of shares of common stock authorized for issuance               7,204  
Common stock, number of shares reserved for issuance     24,077   24,077        
2020 Plan [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Common stock, number of shares reserved for issuance 4,860,000   4,082,708   4,082,708        
Percentage of issued and outstanding shares of common stock 15.00%                
Equity compensation period 3 years                
Stock Options [Member] | Board of Directors [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Expected life assumption using simplified method, description         For stock options granted to the board of directors, the Company determined the expected life assumption using the simplified method as the starting point with an average period of twelve (12) months added to take into account for the extended range of time of 12 to 18 months vested stock options granted to board of directors may be exercised upon termination.        
Expected life assumption using simplified method         12 months        
Stock Options [Member] | Minimum [Member] | Board of Directors [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Vesting period of stock options granted         12 months        
Stock Options [Member] | Maximum [Member] | Board of Directors [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Vesting period of stock options granted         18 months        
Warrants [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Basic weighted average shares outstanding     509,117   509,117        
Anelixis [Member] | Minimum [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Expected life assumption using simplified method   5 years              
Anelixis [Member] | Maximum [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Expected life assumption using simplified method   5 years 10 months 24 days              
Otic Pharma [Member] | Anelixis [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Ownership percentage     100.00%   100.00%        
Otic Pharma, Inc. [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Ownership percentage     100.00%   100.00%