Financing Arrangements - Summary of Interest Expense Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2019
Interest Expense Recognized [Line Items]
Interest Expense, Debt, Excluding Amortization	$ 781	$ 2,344
Amortization of Debt Discount (Premium)	2,171	6,436
Amortization of Debt Issuance Costs	317	947
1.25% convertible senior notes due 2019
Interest Expense Recognized [Line Items]
Interest Expense, Debt	$ 3,269	$ 9,727

[Line Items] for Interest Expense Recognized [Table]

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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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Amount of amortization expense attributable to debt issuance costs.

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

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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