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Interest Expense on Convertible Senior Notes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument
Contractual interest expense on the coupon	$ 5,750	$ 5,734
Amortization of the discount component and debt issue fees recognized as interest expense	13,995	13,318
Total interest expense on the convertible debt	$ 19,745	$ 19,052

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Contractual interest expense on the coupon.

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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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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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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