Annual report pursuant to Section 13 and 15(d)

Capital Stock (Detail)

v3.21.1
Capital Stock (Detail)
1 Months Ended 4 Months Ended 12 Months Ended
Dec. 08, 2020
USD ($)
shares
Dec. 02, 2020
USD ($)
$ / shares
Nov. 20, 2020
day
$ / shares
shares
Oct. 28, 2020
USD ($)
$ / shares
shares
Dec. 04, 2019
$ / shares
shares
Oct. 24, 2019
Jan. 26, 2019
USD ($)
$ / shares
shares
Jan. 09, 2019
USD ($)
$ / shares
shares
May 31, 2019
USD ($)
$ / shares
shares
Sep. 23, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Nov. 02, 2020
shares
Aug. 24, 2020
$ / shares
Dec. 31, 2018
USD ($)
Class of Stock [Line Items]                              
Reverse stock split, conversion ratio           0.0333                  
Number of shares issued in transaction 50,000     1,600,000 5,000                    
Price for share (usd per share) | $ / shares       $ 2.20 $ 7.86                    
Consideration received on transaction | $   $ 2,400,000   $ 2,900,000                      
Offering costs | $ $ 6,000     $ 534,000                      
Warrants to purchase common stock, issued (shares)       94,000       31,000         94,092    
Warrants, exercise period       5 years       5 years              
Exercise price of warrant (usd per share) | $ / shares       $ 2.42       $ 7.43     $ 104.18        
Common stock, par value (usd per share) | $ / shares   $ 0.0001                 $ 0.0001 $ 0.0001   $ 0.0001  
Proceeds from offerings of common stock, net of certain offering costs | $ $ 159,000                   $ 3,074,000 $ 5,412,000      
Fair value of warrants | $             $ 183,000 $ 168,000     1,000 $ 178,000     $ 248,000
Issuance of common stock, conversions and exchanges (shares)                 51,000     174,000      
Issuance of common stock, conversions and exchanges | $                     $ 1,577,000 $ 962,000      
Preferred stock, shares authorized                     9,764,000 9,764,000      
Preferred stock, shares outstanding (shares)                     0 0      
Common Stock                              
Class of Stock [Line Items]                              
Issuance of common stock, conversions and exchanges (shares)                     399,000 225,000      
Atlas Sciences                              
Class of Stock [Line Items]                              
Long-term debt | $                     $ 0 $ 1,300,000      
Atlas Sciences | Common Stock                              
Class of Stock [Line Items]                              
Issuance of common stock, conversions and exchanges (shares)                   399,000          
Issuance of common stock, conversions and exchanges | $                   $ 1,600,000          
H.C. Wainwright                              
Class of Stock [Line Items]                              
Warrants to purchase common stock, issued (shares)             36,000 445,000              
Warrants, exercise period             5 years                
Exercise price of warrant (usd per share) | $ / shares             $ 7.59 $ 6.75              
Public Offering                              
Class of Stock [Line Items]                              
Consideration received on transaction | $             $ 3,000,000.0 $ 2,400,000              
Offering costs | $             $ 525,000 $ 563,000              
Warrants to purchase common stock, issued (shares)             507,000                
Exercise price of warrant (usd per share) | $ / shares             $ 6.90                
Warrant Exchange                              
Class of Stock [Line Items]                              
Number of shares issued in transaction     11,000                        
Common stock, par value (usd per share) | $ / shares     $ 0.0001                        
Issuance of common stock, conversions and exchanges | $                     $ 10,000        
Trading days of no stock issuance | day     5                        
Number of shares called by each warrant     0.2                        
Warrant Exchange | Common Stock                              
Class of Stock [Line Items]                              
Issuance of common stock, conversions and exchanges (shares)                     11,000        
Convertible Debt | Convertible Promissory Note                              
Class of Stock [Line Items]                              
Long-term debt | $                 $ 350,000     $ 612,000      
Convertible Debt, Adjusted Conversion Price Portion                              
Class of Stock [Line Items]                              
Conversion price of notes (usd per share) | $ / shares                 $ 6.82