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Convertible Subordinated Notes
 12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
CONVERTIBLE SUBORDINATED NOTES CONVERTIBLE SUBORDINATED NOTES
During the year ended December 31, 2021, we converted $2.4 million in aggregate principal amount of our 2.75% convertible subordinated notes due 2021 (the “Convertible Notes”) held by certain holders for $3.8 million in cash and recorded $1.4 million for the reacquisition of the equity component. The Convertible Notes matured on March 15, 2021, at which time all Convertible Notes outstanding, $0.2 million in aggregate principal amount, were paid in full in cash at par value. Therefore, no Convertible Notes remain outstanding at December 31, 2022 and 2023.
The interest expense and accretion of debt discount and debt issuance costs related to our Convertible Notes are as follows (in thousands):
Years ended December 31,
202120222023
Convertible Notes interest expense$18 $— $— 
Convertible Notes accretion of debt discount20 — — 
Convertible Notes amortization of debt issuance costs1 — — 
The effective interest rate on the unamortized debt discount and debt issuance costs for the year ended December 31, 2021 was 3.1%