Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (unaudited) (Parenthetical)

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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Class of Stock [Line Items]            
Warrants exercise price (in dollars per share)     $ 0.57      
Stock Issuance January 2021 [Member]            
Class of Stock [Line Items]            
Price per share     $ 0.80      
Transactional expenses     $ 3,096      
Stock Issuance February 2021 [Member]            
Class of Stock [Line Items]            
Price per share     $ 1.20      
Transactional expenses     $ 5,002      
Stock Issuance At Market Offering January 2021 [Member]            
Class of Stock [Line Items]            
Transactional expenses     $ 230      
Stock Issuance At Market Offering April And June 2021 [Member]            
Class of Stock [Line Items]            
Transactional expenses   $ 612        
Stock Issuance At Market Offering July, August and September 2021 [Member]            
Class of Stock [Line Items]            
Transactional expenses $ 389          
Stock Issuance February And March 2020 [Member]            
Class of Stock [Line Items]            
Warrants exercise price (in dollars per share)           $ 0.57
Stock issuance February 2020 [Member]            
Class of Stock [Line Items]            
Price per share           $ 1,000.00
Transactional expenses           $ 711
Stock Issuance February 2020 [Member]            
Class of Stock [Line Items]            
Warrants exercise price (in dollars per share)           $ 0.57
Transactional expenses           $ 292
Stock Issuance March 2020 [Member]            
Class of Stock [Line Items]            
Warrants exercise price (in dollars per share)           $ 1.10
Transactional expenses           $ 1,221
Stock Issuance At Market Offering May And June 2020 [Member]            
Class of Stock [Line Items]            
Transactional expenses         $ 1,131  
Stock Issuance July 2020 [Member]            
Class of Stock [Line Items]            
Transactional expenses       $ 829    
Stock Issuance At Market Offering September 2020 [Member]            
Class of Stock [Line Items]            
Transactional expenses       $ 267