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Carrying Value of Convertible Senior Notes (Detail) - 2.125% Convertible Senior Notes due 2021 - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Principal amount	$ 114,989	$ 115,000
Unamortized debt discount	(9,781)	(13,395)
Unamortized debt issuance costs	(1,720)	(2,355)
Total convertible senior notes	$ 103,488	$ 99,250

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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