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Debt - Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jul. 17, 2020
Long-term debt |  |  |  |  |
Amortization of debt issuance costs |  |  | $ 911 | $ 510 |
Effective interest rate of the liability component | 11.50% |  | 11.50% |  | 11.00%
Convertible debt | 3.00% Convertible senior notes due 2022 |  |  |  |  |
Long-term debt |  |  |  |  |
Contractual interest expense | $ 1,131 | $ 1,125 | $ 2,241 | 2,244 |
Amortization of debt issuance costs | 180 | 114 | 355 | 225 |
Amortization of debt discount |  | 2,295 |  | 4,520 |
Total | $ 1,311 | $ 3,534 | $ 2,596 | $ 6,989 |
Effective interest rate of the liability component | 3.50% | 11.00% | 3.50% | 11.00% |
Convertible debt | 1.50% Convertible senior notes due 2026 |  |  |  |  |
Long-term debt |  |  |  |  |
Contractual interest expense | $ 1,066 | $ 1,066 | $ 2,135 | $ 2,142 |
Amortization of debt issuance costs | 279 | 124 | 556 | 248 |
Amortization of debt discount |  | 3,239 |  | 6,473 |
Total | $ 1,345 | $ 4,429 | $ 2,691 | $ 8,863 |
Effective interest rate of the liability component | 1.90% | 10.20% | 1.90% | 10.20% |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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