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Convertible Subordinated Notes | 6 Months Ended
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Jun. 30, 2020
Convertible Subordinated Notes [Abstract] |
Convertible Subordinated Notes | CONVERTIBLE SUBORDINATED NOTES The carrying values of the liability and equity components of our 2.75% convertible subordinated notes due 2021 (the “Convertible Notes”) at December 31, 2019 and June 30, 2020 are reflected on our Consolidated Balance Sheet as follows (in thousands):
| December 31, 2019 |  |  | June 30, 2020 |
Current liabilities: |  |  |
Principal amount | $ | 6,319 |  |  | $ | 6,319 |
Unamortized discount of liability component | (319 | ) |  | (187 | )
Convertible Notes issuance costs, net of accumulated amortization of $130 and $142, respectively | (29 | ) |  | (17 | )
Carrying value of the liability component | $ | 5,971 |  |  | $ | 6,115 |
Carrying value of the equity component | $ | 789 |  |  | $ | 789 |
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, 2019 and June 30, 2020. The fair value of the Convertible Notes, which are Level 2 measurements, was $6.4 million at June 30, 2020. The Convertible Notes are due in March 2021 and bear interest at 2.75% per year, which is payable semi-annually in arrears on March 15 and September 15 of each year. At June 30, 2020, the adjusted conversion rate of the Convertible Notes was 45.7053 shares of our common stock per $1,000 principal amount of Convertible Notes, equivalent to an adjusted conversion price of $21.88 per share of common stock. The interest expense and accretion of debt discount and debt issuance costs related to our Convertible Notes during the three and six months ended June 30, 2019 and 2020 is as follows (in thousands):
| Three months ended June 30, |  | Six months ended June 30,
| 2019 |  |  | 2020 |  |  | 2019 |  |  | 2020 |
Convertible Notes interest expense | $ | 44 |  |  | $ | 43 |  |  | $ | 87 |  |  | $ | 87 |
Convertible Notes accretion of debt discount | 59 |  |  | 66 |  |  | 117 |  |  | 131 |
Convertible Notes amortization of debt issuance costs | 5 |  |  | 6 |  |  | 11 |  |  | 12 |
The remaining unamortized debt discount and the remaining unamortized debt issuance costs are being amortized using the effective interest method over the remaining term of approximately eight months of the Convertible Notes. The effective interest rate on the unamortized debt discount for both the three and six months ended June 30, 2019 and 2020 was 11.4%. The effective interest rate on the debt issuance costs for both the three and six months ended June 30, 2019 and 2020 was 3.2%.

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