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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 23, 2020
USD ($)
shares
Dec. 18, 2020
$ / shares
shares
Oct. 19, 2020
$ / shares
Sep. 14, 2020
USD ($)
shares
Aug. 08, 2019
$ / shares
Dec. 31, 2020
USD ($)
Segment
Reporting_Unit
shares
Dec. 31, 2019
USD ($)
shares
Mar. 31, 2020
shares
Dec. 31, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]                  
Net loss           $ (22,811,000) $ (16,011,000)    
Cash used in operating activities           (15,212,000) (13,857,000)    
Cash and cash equivalents           114,195,000 8,791,000   $ 12,972,000
Working capital           113,100,000      
Accumulated deficit           (80,393,000) (57,582,000)    
Proceeds from issuance of common stock, net           $ 9,000,000 9,676,000    
Closing bid price per NASDAQ listing notification letter | $ / shares         $ 1.00        
Consecutive business days for closing bid price of common stock         30 days        
Reverse stock split, description           one-for-eighteen      
Number of consecutive trading days required to regain compliance     10 days            
Cash, cash equivalents and restricted cash, maturity period           three months or less      
Cash equivalents           $ 9,200,000 0    
Financial assets transfers level 1 to 2           0 0    
Financial assets transfers level 2 to 1           0 0    
Financial liabilities transfers level 1 to 2           0 0    
Financial liabilities transfers level 2 to 1           $ 0 0    
Number of operating business segments | Segment           1      
Number of reporting units | Reporting_Unit           1      
Impairment charge           $ 0 1,867,000    
Impairments of long-lived assets           $ 0 $ 0    
Antidilutive securities excluded from computation of earnings per share, amount | shares           3,959,302 487,275    
Expected life assumption using simplified method             6 years    
Tax benefit           $ 0      
Income tax examination, likelihood of settlement, description           The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon settlement.      
Income tax examination, likelihood of settlement, percentage           50.00%      
2014 Stock Incentive Plan [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Increase in number of shares of common stock authorized for issuance | shares               28,816  
Common stock, number of shares reserved for issuance | shares           0      
Equity compensation period           10 years      
2014 Employee Stock Purchase Plan [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Increase in number of shares of common stock authorized for issuance | shares               7,204  
Common stock, number of shares reserved for issuance | shares             24,077    
2020 Plan [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Common stock, number of shares reserved for issuance | shares   4,860,000       4,167,044      
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      
Fair Value, Measurements, Recurring [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Assets measured at fair value           $ 0 $ 0    
Liabilities measured at fair value           $ 0 $ 0    
Maximum [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Expected life assumption using simplified method           6 years      
Maximum [Member] | Stock Options [Member] | Board of Directors [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Vesting period of stock options granted           12 months      
Minimum [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Stock price per share | $ / shares     $ 1.00            
Expected life assumption using simplified method           4 years      
Minimum [Member] | Stock Options [Member] | Board of Directors [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Vesting period of stock options granted           18 months      
Series X1 Preferred Stock [Member] | Stock Purchase Agreement [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Proceeds from issuance of common stock, net $ 9,000,000                
Common Stock [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Proceeds from issuance of common stock, net $ 9,000,000                
Common stock, number of shares sold | shares 1,004,111         1,004,111      
Common Stock [Member] | Series X1 Preferred Stock [Member] | Stock Purchase Agreement [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Common stock, number of shares sold | shares 1,004,111                
Anelixis [Member] | Maximum [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Expected life assumption using simplified method       5 years 10 months 24 days          
Anelixis [Member] | Minimum [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Expected life assumption using simplified method       5 years          
Anelixis [Member] | Series X1 Preferred Stock [Member] | Stock Purchase Agreement [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Preferred stock shares agreed to sell | shares       199,112          
Preferred stock shares aggregate purchase price       $ 99,100,000          
Business combination additional commitments in equity financing       $ 9,000,000          
Preferred stock, par value | $ / shares   $ 0.001              
Anelixis [Member] | Common Stock [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Shares of common stock issued upon conversion of each share of preferred stock | shares       55.5556          
Anelixis [Member] | Common Stock [Member] | Series X1 Preferred Stock [Member] | Stock Purchase Agreement [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Shares of common stock issued upon conversion of each share of preferred stock | shares       55.5556          
Otic Pharma [Member] | Anelixis [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Ownership percentage           100.00%      
Otic Pharma, Inc. [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Ownership percentage           100.00%