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Convertible Senior Notes (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jul. 26, 2018 | Dec. 31, 2017 | Jun. 30, 2014 | Jul. 31, 2013
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Debt Instrument [Line Items] |  |  |  |  |
Convertible senior notes, principal\ fair value amount | $ 146,436 |  | $ 156,647 |  |
Convertible senior notes, debt issuance costs | 1,380 |  | 2,075 |  |
Convertible senior notes, net of debt issuance costs | 145,056 |  | 154,572 |  |
4.25% Convertible Senior Notes (due 2018) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible senior notes, principal\ fair value amount |  |  | 21,178 |  | $ 100,000
Convertible senior notes, debt issuance costs |  |  | 103 |  |
Convertible senior notes, net of debt issuance costs |  |  | 21,075 |  |
3.25% Convertible Senior Notes (due 2020) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible senior notes, principal\ fair value amount | 33,436 | $ 8,000 | 22,469 |  |
Convertible senior notes, net of debt issuance costs | 33,436 |  | 22,469 |  |
4.875% Convertible Senior Notes (due 2020) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible senior notes, principal\ fair value amount | 113,000 |  | 113,000 | $ 115,000 |
Convertible senior notes, debt issuance costs | 1,380 |  | 1,972 |  |
Convertible senior notes, net of debt issuance costs | $ 111,620 |  | $ 111,028 |  |

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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