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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Lincoln Park Capital Fund, LLC [Member]
Common Stock [Member]
Common Stock [Member]
Lincoln Park Capital Fund, LLC [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Lincoln Park Capital Fund, LLC [Member]
Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2019 $ 54,545   $ 18   $ 168,746   $ (114,219)
Beginning Balance (in shares) at Dec. 31, 2019     17,834,570        
Stock-based compensation 1,319       1,319    
Issuance of common stock from exercise of stock options 27       27    
Issuance of common stock from exercise of stock options (in shares)     15,185        
Issuance of common stock from Employee Stock Purchase Plan 3       3    
Issuance of common stock from Employee Stock Purchase Plan (in shares)     1,397        
Net loss (15,857)           (15,857)
Ending Balance at Jun. 30, 2020 40,037   $ 18   170,095   (130,076)
Ending Balance (in shares) at Jun. 30, 2020     17,851,152        
Beginning Balance at Dec. 31, 2019 54,545   $ 18   168,746   (114,219)
Beginning Balance (in shares) at Dec. 31, 2019     17,834,570        
Net loss (32,800)            
Ending Balance at Dec. 31, 2020 27,282   $ 19   174,240   (146,977)
Ending Balance (in shares) at Dec. 31, 2020     18,546,786        
Beginning Balance at Mar. 31, 2020 46,802   $ 18   169,476   (122,692)
Beginning Balance (in shares) at Mar. 31, 2020     17,834,570        
Stock-based compensation 589       589    
Issuance of common stock from exercise of stock options 27       27    
Issuance of common stock from exercise of stock options (in shares)     15,185        
Issuance of common stock from Employee Stock Purchase Plan 3       3    
Issuance of common stock from Employee Stock Purchase Plan (in shares)     1,397        
Net loss (7,384)           (7,384)
Ending Balance at Jun. 30, 2020 40,037   $ 18   170,095   (130,076)
Ending Balance (in shares) at Jun. 30, 2020     17,851,152        
Ending Balance at Jun. 30, 2021 17,736   $ 21   182,857   (165,142)
Ending Balance (in shares) at Jun. 30, 2021     21,459,498        
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 1,463       1,463    
Issuance of common stock under the at-the-market sales agreement, net of commissions and allocated fees 6,764   $ 2   6,762    
Issuance of common stock under the at-the-market sales agreement, net of commissions and allocated fees (in shares)     2,733,492        
Issuance of common stock from Employee Stock Purchase Plan 17       17    
Issuance of common stock from Employee Stock Purchase Plan (in shares)     9,132        
Issuance of common stock to Lincoln Park Capital Fund   $ 375       $ 375  
Issuance of common stock to Lincoln Park Capital Fund, shares       170,088      
Net loss (18,165)           (18,165)
Ending Balance at Jun. 30, 2021 17,736   $ 21   182,857   (165,142)
Ending Balance (in shares) at Jun. 30, 2021     21,459,498        
Beginning Balance at Mar. 31, 2021 23,685   $ 20   179,013   (155,348)
Beginning Balance (in shares) at Mar. 31, 2021     19,914,407        
Stock-based compensation 745       745    
Issuance of common stock under the at-the-market sales agreement, net of commissions and allocated fees 2,708   $ 1   2,707    
Issuance of common stock under the at-the-market sales agreement, net of commissions and allocated fees (in shares)     1,365,871        
Issuance of common stock from Employee Stock Purchase Plan 17       17    
Issuance of common stock from Employee Stock Purchase Plan (in shares)     9,132        
Issuance of common stock to Lincoln Park Capital Fund   $ 375       $ 375  
Issuance of common stock to Lincoln Park Capital Fund, shares       170,088      
Net loss (9,794)           (9,794)
Ending Balance at Jun. 30, 2021 $ 17,736   $ 21   $ 182,857   $ (165,142)
Ending Balance (in shares) at Jun. 30, 2021     21,459,498