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Convertible Subordinated Notes | 12 Months Ended
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Dec. 31, 2022
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, 2021 and 2022. 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,
| 2020 |  | 2021 |  | 2022
Convertible Notes interest expense | $ | 149 |  |  | $ | 18 |  |  | $ | — |
Convertible Notes accretion of debt discount | 216 |  |  | 20 |  |  | — |
Convertible Notes amortization of debt issuance costs | 20 |  |  | 1 |  |  | — |
The effective interest rate on the unamortized debt discount and debt issuance costs for the year ended December 31, 2021 was 3.1%

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- Definition The entire disclosure for borrowings under subordinated debt agreements that qualify as available in computing net capital under SEC's uniform net capital rule, including restrictive covenants, collateral, interest rates and due dates, amounts due by date and amount owed in total. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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