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Notes Payable (Tables)
12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Summary of Long Term Debt
Long-term debt consisted of the following (in thousands):
December 31,
20212020
Principal amount of long-term debt$— $20,000 
Less: Current portion of long-term debt— — 
Long-term debt, net of current portion— 20,000 
Final payment fee— 1,000 
Debt discount, net of accretion— (1,346)
Long-term debt, net of discount and current portion$— $19,654