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Stockholders' Equity - Additional Information (Detail)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 15, 2020
shares
Sep. 14, 2020
USD ($)
shares
Jun. 10, 2020
shares
Feb. 13, 2020
USD ($)
Feature
$ / shares
shares
Jan. 15, 2020
USD ($)
$ / shares
shares
Apr. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Jul. 23, 2018
USD ($)
Class Of Stock [Line Items]                      
Proceeds from issuance of common stock | $                 $ 9,676,000    
Warrant inducement expense | $               $ 4,829,000      
Warrants available for exercise             367,335 367,335   392,815  
Conversion of stock, shares converted     3,285                
Preferred stock, par value | $ / shares             $ 0.001 $ 0.001   $ 0.001  
Issuance of common stock in connection with conversion of preferred stock, shares               (3,285)      
Preferred shares outstanding             511 511   0  
Net proceeds from issuance of preferred stock after deducting offering costs | $               $ 95,226,000      
Amortization of outstanding stock-based compensation expenses | $             $ 92,940 $ 726,455      
Former Board of Directors [Member]                      
Class Of Stock [Line Items]                      
Award vesting period               18 months      
PRSUs [Member]                      
Class Of Stock [Line Items]                      
Number of shares vested               3,055      
Value of shares vested | $               $ 204,765      
Anelixis [Member]                      
Class Of Stock [Line Items]                      
Warrants available for exercise             55,583.875 55,583.875   0  
Assumed and replaced               55,583.875      
Anelixis [Member] | Common Stock Options [Member]                      
Class Of Stock [Line Items]                      
Estimated fair value, assumed and replaced               1,346,398      
Estimated fair value, assumed and replaced value | $   $ 3,278,000                  
Series A Warrants [Member]                      
Class Of Stock [Line Items]                      
Warrants available for exercise             0 0   191,617  
Series B Warrants [Member]                      
Class Of Stock [Line Items]                      
Warrants available for exercise             0 0   191,617  
Series X1 Preferred Stock [Member]                      
Class Of Stock [Line Items]                      
Warrants available for exercise             55,583.875 55,583.875      
Series X1 Preferred Stock [Member] | Anelixis [Member]                      
Class Of Stock [Line Items]                      
Issuance of common stock   140,026                  
Series X1 Preferred Stock [Member] | Anelixis [Member] | Common Stock Options [Member]                      
Class Of Stock [Line Items]                      
Estimated fair value, assumed and replaced   1,346,398                  
Estimated fair value, assumed and replaced value | $   $ 6,100,000                  
Series X Preferred Stock [Member]                      
Class Of Stock [Line Items]                      
Number of embedded features within preferred stock | Feature       2              
Series X1 Preferred Stock [Member] | Anelixis [Member]                      
Class Of Stock [Line Items]                      
Issuance of common stock   140,026                  
Securities Purchase Agreement [Member] | 2019 Equity Offering [Member]                      
Class Of Stock [Line Items]                      
Common stock shares agreed to sell           191,617          
Common stock shares gross proceeds value | $           $ 10,700,000          
Private Placement [Member]                      
Class Of Stock [Line Items]                      
Warrants available for exercise             338,592 338,592   0  
Private Placement [Member] | Series A Warrants [Member] | 2019 Equity Offering [Member]                      
Class Of Stock [Line Items]                      
Warrant exercise price per share | $ / shares           $ 72.00          
Warrants exercisable term           18 months          
Private Placement [Member] | Series B Warrants [Member] | 2019 Equity Offering [Member]                      
Class Of Stock [Line Items]                      
Warrant exercise price per share | $ / shares           $ 724.00          
Warrants exercisable term           5 years          
Placement Agent [Member]                      
Class Of Stock [Line Items]                      
Warrants available for exercise             9,581 9,581   9,581  
Placement Agent [Member] | 2019 Equity Offering [Member]                      
Class Of Stock [Line Items]                      
Warrant exercise price per share | $ / shares           $ 69.66          
Percentage of warrants to issue shares of common stock           5.00%          
Percentage of warrant exercise price per share           125.00%          
Warrants offering price maturity date           Apr. 30, 2024          
Common Stock [Member]                      
Class Of Stock [Line Items]                      
Number of shares issued in exchange of warrants             20,834 404,068 191,617    
Warrants available for exercise             367,335 367,335      
Issuance of common stock in connection with conversion of preferred stock, shares     182,500         182,500      
Number of shares vested             1,667 3,056      
Common Stock [Member] | Anelixis [Member]                      
Class Of Stock [Line Items]                      
Issuance of common stock   175,488                  
Convertible preferred stock, shares issued upon conversion of each share   55.5556                  
Common Stock [Member] | Private Placement [Member] | Series A Warrants [Member] | Maximum [Member] | 2019 Equity Offering [Member]                      
Class Of Stock [Line Items]                      
Warrants to issue shares of common stock           191,617          
Common Stock [Member] | Private Placement [Member] | Series B Warrants [Member] | Maximum [Member] | 2019 Equity Offering [Member]                      
Class Of Stock [Line Items]                      
Warrants to issue shares of common stock           191,617          
Common Stock [Member] | Placement Agent [Member] | Maximum [Member] | 2019 Equity Offering [Member]                      
Class Of Stock [Line Items]                      
Warrants to issue shares of common stock           9,580          
Warrant [Member] | Anelixis [Member]                      
Class Of Stock [Line Items]                      
Estimated fair value, assumed and replaced value | $   $ 12,944,000                  
Warrant [Member] | Series X1 Preferred Stock [Member] | Anelixis [Member]                      
Class Of Stock [Line Items]                      
Assumed and replaced   55,583.875                  
Warrant Exercise Agreements [Member] | Warrants [Member]                      
Class Of Stock [Line Items]                      
Common stock shares gross proceeds value | $         $ 5,800,000            
Warrants to issue shares of common stock         383,234            
Warrant reduced exercise price per share | $ / shares         $ 12.87            
Warrant additional exercise price per share | $ / shares         2.25            
Warrant Exercise Agreements [Member] | Common Stock [Member]                      
Class Of Stock [Line Items]                      
Warrants to issue shares of common stock 44,643                    
Warrant exercise price per share | $ / shares         $ 12.96            
Warrants exercisable term         5 years 6 months            
Number of shares issued in exchange of warrants 20,834                    
Warrant Exercise Agreements [Member] | Common Stock [Member] | Maximum [Member]                      
Class Of Stock [Line Items]                      
Warrants to issue shares of common stock         383,234            
Warrant Exercise Agreements [Member] | Common Stock [Member] | Placement Agent [Member]                      
Class Of Stock [Line Items]                      
Warrant exercise price per share | $ / shares         $ 18.90            
Percentage of warrants to issue shares of common stock         5.00%            
Warrant Exercise Agreements [Member] | Common Stock [Member] | Placement Agent [Member] | Maximum [Member]                      
Class Of Stock [Line Items]                      
Warrants to issue shares of common stock         19,161            
Stock Purchase Agreement [Member] | Series X1 Preferred Stock [Member]                      
Class Of Stock [Line Items]                      
Issuance of preferred stock   199,112                  
Preferred stock shares aggregate purchase price | $   $ 99,100,000                  
Net proceeds from issuance of preferred stock after deducting offering costs | $   95,200,000                  
Business combination additional commitments in equity financing | $   $ 9,000,000                  
Stock Purchase Agreement [Member] | Common Stock [Member] | Series X1 Preferred Stock [Member]                      
Class Of Stock [Line Items]                      
Convertible preferred stock, shares issued upon conversion of each share   55.5556                  
Stock Purchase Agreement [Member] | Common Stock [Member] | Series X1 Preferred Stock [Member] | Directors and Employees [Member]                      
Class Of Stock [Line Items]                      
Convertible preferred stock, shares issued upon conversion of each share             55.5556 55.5556      
Piper Jaffray & Co. [Member] | Equity Distribution Agreement [Member]                      
Class Of Stock [Line Items]                      
Equity distribution agreement maximum value of common shares issuable | $                     $ 9,800,000
Piper Jaffray & Co. [Member] | Equity Distribution Agreement [Member] | Common Stock [Member]                      
Class Of Stock [Line Items]                      
Common stock number of shares issued               1,401   1,401  
Proceeds from issuance of common stock | $               $ 110,000   $ 110,000  
Exchanging Stockholders [Member] | Exchange Agreement [Member]                      
Class Of Stock [Line Items]                      
Reimbursement of expenses | $       $ 25,000              
Conversion of stock blocker provision percentage       9.99%              
Exchanging Stockholders [Member] | Exchange Agreement [Member] | Series X Preferred Stock [Member]                      
Class Of Stock [Line Items]                      
Conversion of stock, shares issued       3,796              
Number of designated preferred stock shares       10,000              
Preferred stock, par value | $ / shares       $ 0.001              
Exchanging Stockholders [Member] | Exchange Agreement [Member] | Common Stock [Member]                      
Class Of Stock [Line Items]                      
Conversion of stock, shares converted       210,888              
Convertible preferred stock, shares issued upon conversion of each share       55.5556