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Debt - Carrying amount and Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Carrying Amount |  |
Convertible Notes |  |
Convertible senior notes | $ 17,647 | $ 17,434
Fair Value |  |
Convertible Notes |  |
Convertible senior notes | $ 32,048 | 25,073
Convertible Senior Notes 1.25 Percent Due 2020 |  |
Convertible Notes |  |
Interest rate of debt (as a percent) | 1.25% |
Convertible Senior Notes 1.25 Percent Due 2020 | Carrying Amount |  |
Convertible Notes |  |
Convertible senior notes | $ 17,647 | 17,434
Convertible Senior Notes 1.25 Percent Due 2020 | Fair Value |  |
Convertible Notes |  |
Convertible senior notes | $ 32,048 | $ 25,073

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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