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Debt (Tables)
 12 Months Ended
Dec. 31, 2024
Debt Disclosure [Abstract]  
Summary of Net Carrying Amount of Debt
The 2029 Senior Secured Notes, net consists of the following (in thousands):
December 31,
2024
Principal gross amount$40,879 
Add: unamortized debt premium1,621 
Less: unamortized issuance costs(670)
Net carrying amount$41,830 
The 2025 Convertible Notes consist of the following (in thousands):
December 31,
20242023
Principal$14,949 $161,898 
Add: fair value of embedded derivative — — 
Less: unamortized debt discount (25)(1,106)
Less: unamortized issuance costs(19)(880)
Net carrying amount$14,905 $159,912 
Summary of Interest Expense
The following table sets forth total interest expense, annualized effective interest rate, and interest expense related to related parties, if applicable, for each of the debt instruments detailed above (in thousands, except for percentages):
Year Ended December 31,
20242023
2029 Senior Secured Notes
Contractual interest expense$562 
Amortization of debt issuance costs24 
Amortization of debt discount/premium(57)
Total interest expense$529 
Related party interest expense$411 
2025 Convertible Notes
Contractual interest expense$3,912 $5,262 
Amortization of debt issuance costs489 659 
Amortization of debt discount/premium614 828 
Total interest expense$5,015 $6,749 
Related party interest expense$2,847 $3,350 
Short-Term Loan
Contractual interest expense$1,391 
Amortization of debt discount/premium3,330 
Total interest expense$4,721 
Related party interest expense$4,721 
Credit Facility
Contractual interest expense$312 $1,092 
Accretion of exit fee75 200 
Amortization of debt issuance costs117 466 
Total interest expense$504 $1,758 
Other interest expense137 579 
Consolidated interest expense$10,906 $9,086