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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 19, 2020
$ / shares
Sep. 14, 2020
USD ($)
shares
Aug. 08, 2019
$ / shares
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Segment
shares
Sep. 30, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
Mar. 31, 2020
shares
Dec. 31, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]                    
Net loss       $ (6,144,000) $ (2,893,000) $ (16,907,000) $ (11,867,000)      
Cash and cash equivalents       114,464,000 $ 10,814,000 114,464,000 $ 10,814,000 $ 8,791,000   $ 12,972,000
Working capital       109,000,000   109,000,000        
Accumulated deficit       (74,489,000)   $ (74,489,000)   (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              
Reverse stock split, description           On October 5, 2020, Novus effected a reverse stock-split of its issued and outstanding common stock and options for common stock at a ratio of one-for-eighteen. The Company filed an Amended and Restated Certificate of Incorporation with the Secretary of State of the State of Delaware effecting the reverse stock-split. The accompanying condensed consolidated financial statements and notes, as well as other share and per-share data herein, give retroactive effect to the reverse stock-split for all periods presented.        
Cash, cash equivalents and restricted cash, maturity period           three months or less        
Cash equivalents or restricted cash       $ 10,100,000   $ 10,100,000   0    
Number of operating business segments | Segment           1        
Goodwill impairment           $ 0   $ 1,900,000    
Impairment of tangible assets           $ 0        
Antidilutive securities excluded from computation of earnings per share, amount | shares           1,828,531 487,274      
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       421,648   421,648        
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   433,394        
Subsequent Event [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Number of consecutive trading days required to regain compliance 10 days                  
Subsequent Event [Member] | Minimum [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Stock price per share | $ / shares $ 1.00                  
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                
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%   100.00%        
Otic Pharma, Inc. [Member] | Anelixis [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Ownership percentage       100.00%   100.00%