Debt (Tables)
12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Interest Expense
Interest expense for the Adjuvant Notes consist of the following, and is included in long-term convertible notes payable on the accompanying consolidated balance sheet as of December 31, 2021 (in thousands): 

Years Ended December 31,
20212020
Coupon interest$1,959 $396 
Amortization of issuance costs39 
Total$1,998 $404