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Summary of Significant Accounting Policies - Financial Instruments (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 25, 2019
Jan. 31, 2020
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]          
Number of warrants issued (in shares)     467,306 467,306  
Exercise price of warrants (in dollars per share)     $ 3.51 $ 3.51  
Amount paid for clearing fees   $ 231      
Offering costs paid on the issuance of common stock and warrants       $ (510) $ 0
Net proceeds from sale of common stock   $ 2,300      
Percent proceeds to be paid to Lender   10.00%      
Gross proceeds from equity issuance   $ 275      
Payments on the Iliad Note       1,306 0
Warrants exercised (in shares)   (269,240)      
Proceeds from the exercise of warrants       918 $ 0
Proceeds from warrants       1,600  
Warrant liability reclassified into equity       1,405  
Note Purchase Agreement          
Class of Stock [Line Items]          
Percent proceeds to be paid to Lender 10.00%        
Payments on the Iliad Note       $ 226  
Institutional Investor          
Class of Stock [Line Items]          
Number of warrants issued (in shares)   688,360   425,626  
Exercise price of warrants (in dollars per share)   $ 3.3700      
Purchase price (in dollars per share)   $ 0.6250      
Private Placement          
Class of Stock [Line Items]          
Number of warrants issued (in shares)   48,185   41,680  
Exercise price of warrants (in dollars per share)   $ 4.9940      
Amount paid for placement agent commissions   $ 193      
Amount paid related to expenses for registered direct offering and concurrent private placement   $ 50