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Convertible Notes (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Debt Instrument [Line Items] |  |
Principal amount of convertible notes | $ 253,707 | $ 253,707
Total convertible notes | 219,295 | 213,898
Convertible notes, short-term | 80,648 | 78,451
Convertible notes, long-term | 138,647 | 135,447
1.125% Convertible Senior Notes due 2018 |  |
Debt Instrument [Line Items] |  |
Principal amount of convertible notes | 81,207 | 81,207
Unamortized discount | (517) | (2,547)
Unamortized Debt Issuance Expense | $ (42) | $ (209)
Convertible Notes Payable [Member] | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member] |  |
Debt Instrument [Line Items] |  |
Convertible notes stated interest rate (as a percent) | 1.375% | 1.375%
Principal amount of convertible notes | $ 172,500 | $ 172,500
Unamortized discount | (31,556) | (34,506)
Unamortized Debt Issuance Expense | (2,297) | (2,547)
Convertible Senior Notes |  |
Debt Instrument [Line Items] |  |
Convertible notes, long-term | 138,647 | 135,447
Convertible Senior Notes |  |
Debt Instrument [Line Items] |  |
Convertible notes, short-term | $ 80,648 | $ 78,451

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(13)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 2: 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 3: 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)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: 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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