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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Lincoln Park Capital Fund, LLC [Member]
Public Offering [Member]
At The Market Sales Agreement
Public And Private Placements
Common Stock [Member]
Common Stock [Member]
Lincoln Park Capital Fund, LLC [Member]
Common Stock [Member]
Public Offering [Member]
Common Stock [Member]
At The Market Sales Agreement
Common Stock [Member]
Public And Private Placements
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Lincoln Park Capital Fund, LLC [Member]
Additional Paid-in Capital [Member]
Public Offering [Member]
Additional Paid-in Capital [Member]
At The Market Sales Agreement
Additional Paid-in Capital [Member]
Public And Private Placements
Accumulated Other Comprehensive Loss [Member]
Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2020 $ 27,282         $ 19         $ 174,240           $ (146,977)
Beginning Balance (in shares) at Dec. 31, 2020           18,546,786                      
Stock-based compensation 2,003                   2,003            
Issuance of common stock, net of commissions and allocated fees, less issuance costs       $ 7,123         $ 3         $ 7,120      
Issuance of common stock, net of commissions and allocated fees, less issuance costs (in shares)                 2,895,518                
Issuance of common stock from Employee Stock Purchase Plan 17                   17            
Issuance of common stock from Employee Stock Purchase Plan (in share)           9,132                      
Issuance of common stock to Lincoln Park Capital Fund   $ 375                   $ 375          
Issuance of common stock to Lincoln Park Capital Fund (in shares)             170,088                    
Net loss (25,420)                               (25,420)
Ending Balance at Sep. 30, 2021 11,380         $ 22         183,755           (172,397)
Ending Balance (in shares) at Sep. 30, 2021           21,621,524                      
Beginning Balance at Jun. 30, 2021 17,736         $ 21         182,857           (165,142)
Beginning Balance (in shares) at Jun. 30, 2021           21,459,498                      
Stock-based compensation 540                   540            
Issuance of common stock, net of commissions and allocated fees, less issuance costs       359         $ 1         358      
Issuance of common stock, net of commissions and allocated fees, less issuance costs (in shares)                 162,026                
Net loss (7,255)                               (7,255)
Ending Balance at Sep. 30, 2021 11,380         $ 22         183,755           (172,397)
Ending Balance (in shares) at Sep. 30, 2021           21,621,524                      
Beginning Balance at Dec. 31, 2021 17,075         $ 29         197,963           (180,917)
Beginning Balance (in shares) at Dec. 31, 2021           28,505,804                      
Stock-based compensation 1,826                   1,826            
Issuance of common stock from exercise of stock options $ 139                   139            
Issuance of common stock from exercise of stock options (in shares) 51,005         51,005                      
Issuance of common stock, net of commissions and allocated fees, less issuance costs       $ (42) $ 103,010         $ 19       $ (42) $ 102,991    
Issuance of common stock, net of commissions and allocated fees, less issuance costs (in shares)                   18,833,196              
Issuance of common stock from Employee Stock Purchase Plan $ 23                   23            
Issuance of common stock from Employee Stock Purchase Plan (in share)           33,972                      
Issuance of common stock from warrant exercise 11,782         $ 10         11,772            
Issuance of common stock from warrant exercise (in shares)           10,898,540                      
Unrealized losses on available-for-sale marketable securities (263)                             $ (263)  
Net loss (23,647)                               (23,647)
Ending Balance at Sep. 30, 2022 109,903         $ 58         314,672         (263) (204,564)
Ending Balance (in shares) at Sep. 30, 2022           58,322,517                      
Beginning Balance at Jun. 30, 2022 60,515         $ 40         256,908         (135) (196,298)
Beginning Balance (in shares) at Jun. 30, 2022           39,719,572                      
Stock-based compensation 569                   569            
Issuance of common stock from exercise of stock options 139                   139            
Issuance of common stock from exercise of stock options (in shares)           51,005                      
Issuance of common stock, net of commissions and allocated fees, less issuance costs     $ 51,184         $ 14         $ 51,170        
Issuance of common stock, net of commissions and allocated fees, less issuance costs (in shares)               14,252,670                  
Issuance of common stock from warrant exercise 5,890         $ 4         5,886            
Issuance of common stock from warrant exercise (in shares)           4,299,270                      
Unrealized losses on available-for-sale marketable securities (128)                             (128)  
Net loss (8,266)                               (8,266)
Ending Balance at Sep. 30, 2022 $ 109,903         $ 58         $ 314,672         $ (263) $ (204,564)
Ending Balance (in shares) at Sep. 30, 2022           58,322,517