Information Pertaining to 2022 Notes (Detail) $ in Thousands	9 Months Ended
Sep. 30, 2016 USD ($)
Debt Instrument [Line Items]
Beginning balance	$ 14,341
Amortization of debt discount	3,193
Amortization of debt issue costs	124
Exchange of 2022 Notes	(11,400)
Write-off of debt discount and debt issue costs associated with extingishment of debt	2,521
Ending balance	8,779
Principal Amount of Convertible Notes
Debt Instrument [Line Items]
Beginning balance	22,400
Exchange of 2022 Notes	(11,400)
Ending balance	11,000
Debt Discount
Debt Instrument [Line Items]
Beginning balance	(7,764)
Amortization of debt discount	3,193
Write-off of debt discount and debt issue costs associated with extingishment of debt	2,429
Ending balance	(2,142)
Debt Issue Costs
Debt Instrument [Line Items]
Beginning balance	(295)
Amortization of debt issue costs	124
Write-off of debt discount and debt issue costs associated with extingishment of debt	92
Ending balance	$ (79)

Exchange of debt.

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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.

+ References

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Amount of amortization expense attributable to debt issuance costs.

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Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

+ References

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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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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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