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Convertible Subordinated Notes | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Subordinated Borrowings Disclosure | CONVERTIBLE SUBORDINATED NOTES On March 19, 2014, we issued $143.75 million aggregate principal amount of our 2.75% convertible subordinated notes due 2021 (the “Convertible Notes”). The Convertible Notes were due on March 15, 2021 and bear interest at 2.75% per year, which was payable semi-annually in arrears on March 15 and September 15 of each year. In May 2018, we exchanged $115.0 million in aggregate principal amount of Convertible Notes in a privately-negotiated exchange with a limited number of convertible noteholders. We completed privately-negotiated repurchases of $22.4 million, $25,000 and $3.8 million in aggregate principal amount of our Convertible Notes in December 2018, April 2019 and September 2020, respectively. During the year ended December 31, 2021, we converted $2.4 million in aggregate principal amount of our 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. The carrying values of the liability and equity components of the Convertible Notes are reflected on our Consolidated Balance Sheet as follows (in thousands):
| December 31, 2020 |  | December 31, 2021
Long-term liabilities: |  |  |
Principal amount | $ | 2,559 |  |  | $ | — |
Unamortized discount of liability component | (20) |  |  | — |
Convertible Notes issuance costs, net of accumulated amortization of $63 | (1) |  |  | — |
Carrying value of the liability component | $ | 2,538 |  |  | $ | — |
Carrying value of the equity component | $ | 319 |  |  | $ | — |
The carrying value of the liability component and the carrying value of the equity component are recorded in Convertible subordinated notes due 2021 and Additional paid-in capital, respectively, on our Consolidated Balance Sheet at December 31, 2020. 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,
| 2019 |  | 2020 |  | 2021
Convertible Notes interest expense | $ | 174 |  |  | $ | 149 |  |  | $ | 18 |
Convertible Notes accretion of debt discount | 241 |  |  | 216 |  |  | 20 |
Convertible Notes amortization of debt issuance costs | 24 |  |  | 20 |  |  | 1 |
The effective interest rate on the unamortized debt discount and debt issuance costs for both years ended December 31, 2020 and 2021 was 11.4% and 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 http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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