Annual report pursuant to Section 13 and 15(d)

Intangible assets, royalties, and goodwill - Additional information (Details)

v3.21.1
Intangible assets, royalties, and goodwill - Additional information (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 13, 2020
Apr. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Nov. 30, 2020
Sep. 30, 2020
Jul. 20, 2020
Jun. 30, 2020
Jun. 24, 2020
Mar. 17, 2020
Dec. 19, 2019
Nov. 04, 2019
Finite-Lived Intangible Assets [Line Items]                        
Common stock, shares issued (in shares)     51,908,398 47,977,390                
Warrant term         72 months       84 months   24 months 24 months
Warrants, exercise price (in dollars per share)         $ 1.00 $ 0.65 $ 1.05 $ 0.75 $ 1.25 $ 1.62 $ 5.00 $ 5.00
Contract termination costs     $ (649,000) $ 0                
Amortization expense (less than for 2019)     1,500,000 100,000                
Goodwill     18,614,000 18,614,000                
Goodwill, accumulated impairment loss     0 0                
Goodwill, impairment expense     $ 0 $ 0                
ABG Notes                        
Finite-Lived Intangible Assets [Line Items]                        
Debt face amount $ 600,000                      
Interest rate per annum 10.00%   10.00%                  
Halo Acquisition                        
Finite-Lived Intangible Assets [Line Items]                        
Goodwill                     $ 18,614,000  
Licensing arrangement                        
Finite-Lived Intangible Assets [Line Items]                        
Payment of upfront fees in equity   $ 1,000,000.0                    
Termination fee paid $ 100,000                      
Common stock, shares issued (in shares) 72,720                      
Termination fee payable $ 100,000                      
Common stock purchase warrant issuable 150,000                      
Contract termination costs 1,100,000                      
Licensing arrangement | ABG Notes                        
Finite-Lived Intangible Assets [Line Items]                        
Debt face amount $ 600,000                      
Interest rate per annum 10.00%                      
Fair value of debt $ 600,000                      
Licensing arrangement | ABG Warrants                        
Finite-Lived Intangible Assets [Line Items]                        
Warrant term 24 months                      
Warrants, exercise price (in dollars per share) $ 5.00               $ 4.25      
Warrants, fair value (less than) $ 100,000