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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended
Aug. 08, 2019
$ / shares
Mar. 31, 2020
USD ($)
Segment
shares
Mar. 31, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Net loss   $ (8,177,000) $ (4,881,000)  
Cash   11,785,000   $ 8,791,000
Working capital   11,000,000    
Accumulated deficit   $ (65,759,000)   (57,582,000)
Closing bid price per NASDAQ listing notification letter | $ / shares $ 1.00      
Consecutive business days for closing bid price of common stock 30 days      
Stock market granted additional calendar days 180 days      
Closing bid price of common stock per NASDAQ listing notification letter | $ / shares | $ / shares $ 1.00      
Number of consecutive business days required to regain compliance 10 days      
Cash, cash equivalents and restricted cash, maturity period   three months or less    
Cash equivalents or restricted cash   $ 0   $ 0
Number of operating business segments | Segment   1    
Impairment of tangible assets   $ 0    
Antidilutive securities excluded from computation of earnings per share, amount | shares   9,515,858 1,241,717  
2014 Stock Incentive Plan [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Increase in number of shares of common stock authorized for issuance | shares   518,693    
Common stock, number of shares reserved for issuance | shares   401,648    
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   129,673    
Common stock, number of shares reserved for issuance | shares   433,394    
Otic Pharma [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%