Quarterly report pursuant to Section 13 or 15(d)

Capital Structure - Narrative (Details)

v3.22.2
Capital Structure - Narrative (Details)
$ / shares in Units, $ in Millions
 1 Months Ended
Sep. 17, 2021
USD ($)
shares
Jun. 04, 2021
$ / shares
shares
Aug. 31, 2021
USD ($)
shares
Jul. 31, 2021
USD ($)
Jan. 31, 2021
USD ($)
$ / shares
shares
Jun. 30, 2022
class_of_stock
$ / shares
shares
Dec. 31, 2021
$ / shares
shares
Jun. 30, 2021
$ / shares
Class of Stock [Line Items]                
Number of classes of stock authorized to issue | class_of_stock           2    
Number of shares of capital stock authorized to issue (in shares)           205,000,000    
Common stock, shares authorized (in shares)           200,000,000 200,000,000  
Preferred stock, shares authorized (in shares)           5,000,000    
Common stock, par value (in dollars per share) | $ / shares           $ 0.001 $ 0.001  
Preferred stock, par value per share (in dollars per share) | $ / shares           $ 0.001    
Exercise price per share (in dollars per share) | $ / shares         $ 0.012     $ 0.012
Pre-funded warrants exercised (in shares)             25,740  
Warrant                
Class of Stock [Line Items]                
Sale of stock (in shares)         139,747      
Horizon & Powerscourt Notes | Notes Payable | Warrant                
Class of Stock [Line Items]                
Sale of stock (in shares)   33,656            
Exercise price per share (in dollars per share) | $ / shares   $ 31.20            
Warrants or rights exercisable term   10 years            
Nantahala Capital Management LLC                
Class of Stock [Line Items]                
Percentage of ownership 5.00%              
Nantahala                
Class of Stock [Line Items]                
Warrants outstanding (in shares)           114,007    
Underwritten Public Offering                
Class of Stock [Line Items]                
Sale of stock (in shares) 1,200,000       1,200,000      
Net proceeds | $ $ 29.0       $ 37.7      
Underwritten Public Offering | Armistice                
Class of Stock [Line Items]                
Sale of stock (in shares) 500,000       200,000      
Underwritten Public Offering | Nantahala                
Class of Stock [Line Items]                
Sale of stock (in shares)         100,000      
Purchase price (in dollars per share) | $ / shares         $ 31.188      
ATM Agreement                
Class of Stock [Line Items]                
Sale of stock (in shares)     200,000          
Net proceeds | $     $ 5.2 $ 50.0