Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Subsidiary, Sale of Stock [Line Items]    
Warrants exercise price (in dollars per share) $ 0.57 $ 0.57
Issuance of common stock in January 2021 [Member]    
Subsidiary, Sale of Stock [Line Items]    
Price per share $ 0.80  
Transactional expenses $ 3,096  
Issuance of common stock in February 2021 [Member]    
Subsidiary, Sale of Stock [Line Items]    
Price per share $ 1.20  
Transactional expenses $ 5,002  
Issuance of common stock under At-the-market offering [Member]    
Subsidiary, Sale of Stock [Line Items]    
Transactional expenses 2,332 $ 2,304
Issuance of common stock under 2021 Purchase Agreement [Member]    
Subsidiary, Sale of Stock [Line Items]    
Transactional expenses $ 75  
Issuance of Series B Convertible preferred stock and common stock warrants in February 2020 [Member]    
Subsidiary, Sale of Stock [Line Items]    
Price per share   $ 1,000.00
Transactional expenses   $ 711
Issuance of common stock and common stock warrants in February 2020 [Member]    
Subsidiary, Sale of Stock [Line Items]    
Transactional expenses   292
Issuance of common stock in March 2020 [Member]    
Subsidiary, Sale of Stock [Line Items]    
Transactional expenses   1,221
Issuance of common stock in July 2020 [Member]    
Subsidiary, Sale of Stock [Line Items]    
Transactional expenses   $ 829