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Debt - Carrying amount and Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Carrying Amount |  |  |
Convertible Notes |  |  |
Convertible senior notes | $ 24,872 | $ 24,001 |
Fair Value |  |  |
Convertible Notes |  |  |
Convertible senior notes | $ 36,916 | 49,560 |
Convertible Senior Notes 0.375 Percent Due 2018 |  |  |
Convertible Notes |  |  |
Interest rate of debt (as a percent) | 0.375% |  | 0.375%
Convertible Senior Notes 0.375 Percent Due 2018 | Carrying Amount |  |  |
Convertible Notes |  |  |
Convertible senior notes | $ 7,648 | 7,393 |
Convertible Senior Notes 0.375 Percent Due 2018 | Fair Value |  |  |
Convertible Notes |  |  |
Convertible senior notes | $ 10,271 | 14,129 |
Convertible Senior Notes 1.25 Percent Due 2020 |  |  |
Convertible Notes |  |  |
Interest rate of debt (as a percent) | 1.25% |  | 1.25%
Convertible Senior Notes 1.25 Percent Due 2020 | Carrying Amount |  |  |
Convertible Notes |  |  |
Convertible senior notes | $ 17,224 | 16,608 |
Convertible Senior Notes 1.25 Percent Due 2020 | Fair Value |  |  |
Convertible Notes |  |  |
Convertible senior notes | $ 26,645 | $ 35,431 |

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- Definition Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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