Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

v3.20.4
Basis of Presentation (Details) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended
Jan. 11, 2021
Dec. 10, 2020
Dec. 08, 2020
Nov. 25, 2020
Jun. 30, 2020
Jun. 30, 2020
Jun. 17, 2020
May 13, 2020
Mar. 19, 2020
Oct. 31, 2019
Oct. 29, 2019
Jul. 27, 2020
Dec. 31, 2019
Jun. 30, 2020
Dec. 31, 2019
Jul. 27, 2020
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 20, 2018
Basis of Presentation [Line Items]                                                
Accumulated deficit         $ (150,420,000) $ (150,420,000)               $ (150,420,000)     $ (166,082,000) $ (150,420,000)   $ (150,420,000) $ (150,420,000)      
Net Cash Used in Operating Activities                                 (15,489,000)   $ (5,692,000)          
Cash         $ 55,112,000 $ 55,112,000             $ 3,637,000 $ 55,112,000 $ 3,637,000   91,252,000 $ 55,112,000 3,637,000 55,112,000 55,112,000 $ 55,112,000 $ 4,421,000  
Proceeds from exercise of warrants                                 $ 0   $ 691,000 $ 6,400,000 $ 6,300,000      
Net proceeds from underwritten public offering                     $ 4,500,000                          
Number of shares issued during the period       30,184,399                                        
Gross proceeds from issuance of common stock       $ 72,000,000             $ 4,500,000                          
Common Stock, Par or Stated Value Per Share         $ 0.001 $ 0.001               $ 0.001     $ 0.001 $ 0.001   $ 0.001 $ 0.001      
Net Proceeds From Issuance Of Common Stock       68,800,000                                        
Stock Issued During Period, Shares, Warrants Exercised                   29,100,000     29,100,000         29,100,000 14,999,998          
Lincoln Park 2020 Purchase Agreement                                                
Basis of Presentation [Line Items]                                                
Stock Issued During Period, Value, New Issues               $ 1,100,000                                
Number of shares issued during the period               1,000,000 815,827     2,673,000   16,800,000   19,470,000                
Shares Issued, Price Per Share               $ 1.09                                
Number of shares agreed to be issued                 1,000,000                              
Gross proceeds from issuance of common stock                       $ 6,800,000       $ 25,200,000                
Common Stock, Par or Stated Value Per Share                 $ 0.001                              
Authorized value of shares                 $ 50,000,000                              
Term of agreement                 36 months                              
Net Proceeds From Issuance Of Common Stock Shares             30,200,000                                  
Net Proceeds From Issuance Of Common Stock             $ 68,830,000                   $ 107,600,000              
Aggregate Common Stock Purchased                 $ 50,000,000                              
Sales Agreement                                                
Basis of Presentation [Line Items]                                                
Authorized value of shares       100,000,000                                        
Aggregate Common Stock Purchased       $ 100,000,000                                        
Underwriting Agreement                                                
Basis of Presentation [Line Items]                                                
Number of shares issued during the period   29,661,017                                            
Shares Issued, Price Per Share   $ 1.0955                                            
Number of shares agreed to be issued     29,661,017                                          
Net Proceeds From Issuance Of Common Stock   $ 32,300,000                                            
Over allotment | Underwriting Agreement                                                
Basis of Presentation [Line Items]                                                
Number of shares agreed to be issued     4,449,152                                          
Common Stock                                                
Basis of Presentation [Line Items]                                                
Number of shares issued during the period                     2,450,000                          
Shares Issued, Price Per Share                     $ 0.20                         $ 0.90
Stock Issued During Period, Shares, Warrants Exercised                             3,140,000                  
Common Stock | Lincoln Park 2020 Purchase Agreement                                                
Basis of Presentation [Line Items]                                                
Net Proceeds From Issuance Of Common Stock                                 $ 4,700,000              
Subsequent event | Over allotment | Underwriting Agreement                                                
Basis of Presentation [Line Items]                                                
Number of shares issued during the period 4,240,828                                              
Net Proceeds From Issuance Of Common Stock $ 4,700,000                                              
UBS Securities, LLC ("UBS")                                                
Basis of Presentation [Line Items]                                                
Net proceeds from underwritten public offering             $ 72,000,000                                  
Number of shares issued during the period         17,420,000 2,360,000                     10,410,000              
Gross proceeds from issuance of common stock         $ 37,800,000 $ 5,500,000                     $ 28,400,000