The following table summarizes the carrying value of the long-term convertible debt as of December 31, 2021 and 2020 (in thousands): | | | | | | | | | | | | | December 31, | | 2021 | | 2020 | 2024 Notes | | | | Carrying value | $ | 89,361 | | | $ | 81,462 | | Unamortized debt discount and issuance costs | 27,690 | | | 35,589 | | Principal amount | $ | 117,051 | | | $ | 117,051 | | Remaining amortization period (years) | 2.9 | | 3.9 | Fair value(1) | $ | 195,445 | | | $ | 153,220 | | | | | | 2025 Notes | | | | Carrying value | $ | 126,315 | | | $ | 116,349 | | Unamortized debt discount and issuance costs | 46,185 | | | 56,151 | | Principal amount | $ | 172,500 | | | $ | 172,500 | | Remaining amortization period (years) | 3.8 | | 4.8 | Fair value(1) | $ | 177,251 | | | $ | 147,488 | | | | | | 2021 Notes | | | | Carrying value | $ | — | | | $ | 26,557 | | Unamortized debt discount and issuance costs | — | | | 180 | | Principal amount | $ | — | | | $ | 26,737 | | Remaining amortization period (years) | 0.0 | | 0.9 | Fair value(1) | $ | — | | | $ | 26,470 | |
———————— (1)Fair values for notes are derived from available trading prices closest to the respective balance sheet date.
|