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Warrants - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Jun. 14, 2017
Apr. 13, 2016
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 16, 2018
Class of Warrant or Right [Line Items]            
Issuance of shares of common stock   7,500,000 0 0 0  
Warrants sold   7,500,000        
Common stock, price per share   $ 1.25        
Exercise price of warrant   1.50        
Warrants expiry date     Apr. 13, 2021      
Public offering price per warrant   $ 0.01        
Warrants outstanding     3,988,856      
Warrants exercised     7,050      
Securities Purchase Agreement [Member]            
Class of Warrant or Right [Line Items]            
Warrants sold     787,087      
Warrants exercised     98,308      
Public offering price per share and per warrant $ 1.15          
Unexercised warrants           1,987,337
Loan and Security Agreement [Member] | Minimum [Member]            
Class of Warrant or Right [Line Items]            
Beneficial ownership of company's common stock   49.90%        
Ligand [Member] | Loan and Security Agreement [Member]            
Class of Warrant or Right [Line Items]            
Warrants sold   960,000        
Exercise price of warrant   $ 1.50        
Warrants expiry date     Apr. 13, 2021      
Repayments of notes payable in stock   $ 1.2        
Over-Allotment Option [Member]            
Class of Warrant or Right [Line Items]            
Warrants sold   1,125,000        
Private Placement and Registered Direct Offering [Member] | Securities Purchase Agreement [Member]            
Class of Warrant or Right [Line Items]            
Exercise price of warrant $ 1.30          
Warrants expiry date     Dec. 19, 2022      
Number of warrants issued for common stock 0.75          
Warrants exercisable date     Dec. 19, 2017      
Percentage of warrant exercise beneficial ownership limitation of common stock outstanding minimum 4.99%          
Prior notice period of increase beneficial ownership limitation 61 days          
Percentage of minimum beneficial ownership limitation 9.99%          
Description of beneficial ownership limitation     Each holder of a Warrant does not have the right to exercise any portion of its Warrant if the holder, together with its affiliates, would beneficially own in excess of 4.99% of the number of shares of common stock outstanding immediately after giving effect to such exercise (the “Beneficial Ownership Limitation”); provided, however, that upon 61 days’ prior notice to the Company, the holder may increase the Beneficial Ownership Limitation; however, in no event shall the Beneficial Ownership Limitation exceed 9.99%.      
Private Placement and Registered Direct Offering [Member] | Common stock [Member] | Securities Purchase Agreement [Member]            
Class of Warrant or Right [Line Items]            
Issuance of shares of common stock 3,749,783          
Private Placement and Registered Direct Offering [Member] | Maximum [Member] | Common stock [Member] | Securities Purchase Agreement [Member]            
Class of Warrant or Right [Line Items]            
Warrants sold 2,812,337