Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
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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
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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

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Convertible Senior Notes - Summary of Convertible Senior Notes (Detail) - USD ($)	Dec. 31, 2018	Jul. 26, 2018	Dec. 31, 2017	Aug. 31, 2017	Jun. 30, 2014	Jul. 31, 2013
Debt Instrument [Line Items]
Principal/ Fair Value Amount	$ 140,974,000		$ 156,647,000
Debt Issuance Costs	1,182,000		2,075,000
Net Amount	$ 139,792,000		$ 154,572,000
4.25% convertible senior notes (due 2018)
Debt Instrument [Line Items]
Debt instrument, interest rate	4.25%	4.25%	4.25%	4.25%		4.25%
Principal/ Fair Value Amount	$ 0		$ 21,178,000			$ 100,000,000.0
Debt Issuance Costs	0		103,000
Net Amount	$ 0		21,075,000
4.875% convertible senior notes (due 2020)
Debt Instrument [Line Items]
Debt instrument, interest rate	4.875%				4.875%
Principal/ Fair Value Amount	$ 113,000,000		113,000,000		$ 115,000,000
Debt Issuance Costs	1,182,000		1,972,000
Net Amount	$ 111,818,000		111,028,000
3.25% convertible senior notes (due 2020)
Debt Instrument [Line Items]
Debt instrument, interest rate	3.25%	3.25%
Principal/ Fair Value Amount	$ 27,974,000		22,469,000
Debt Issuance Costs	0		0
Net Amount	27,974,000		22,469,000
Oasis Management and Oasis Investments ll Master Fund Ltd. \| 4.25% convertible senior notes (due 2018)
Debt Instrument [Line Items]
Debt instrument, interest rate				4.25%
Oasis Management and Oasis Investments ll Master Fund Ltd. \| 3.25% convertible senior notes (due 2020)
Debt Instrument [Line Items]
Principal/ Fair Value Amount	$ 29,500,000	$ 8,000,000	$ 21,500,000	$ 21,500,000