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Interest Expense and Other
12 Months Ended
Dec. 31, 2021
Other Income and Expenses [Abstract]  
Interest Expense and Other
12.
INTEREST EXPENSE AND OTHER
Interest expense and other for the years ended December 31, 2021 and 2020 consisted of the following (in thousands):
 
    
Year ended
December 31,
 
    
2021
    
2020
 
Interest on term loan debt
   $ 630    $ 200
Interest on PPP loan
     11      16
Interest on convertible note
     700      359
Amortization of debt issuance costs
     725      97
Amortization of debt discount
     752      830
Amortization of premiums on marketable securities, net
     456      —    
Common stock purchase agreement costs
     1,583      —    
  
 
 
    
 
 
 
Interest expense and other
   $ 4,857    $ 1,502