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Debt - Summary of Debt Discount Activity (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Principal Amount Unamortized Debt Discount And Net Carrying Amount Of Liability Component [Line Items]
Beginning balance		$ 18
Discount on debt issued during the period		1,847
Amortization of debt discount		(430)
Extinguishment upon conversion of debt		(1,161)
Ending balance	$ 274	274
Term Loan [Member]
Principal Amount Unamortized Debt Discount And Net Carrying Amount Of Liability Component [Line Items]
Discount on debt issued during the period		300
Amortization of debt discount		(26)
Ending balance	274	274
Convertible Notes Including 5X Notes [Member]
Principal Amount Unamortized Debt Discount And Net Carrying Amount Of Liability Component [Line Items]
Beginning balance		18
Amortization of debt discount		(18)
2015 Bridge Notes [Member]
Principal Amount Unamortized Debt Discount And Net Carrying Amount Of Liability Component [Line Items]
Discount on debt issued during the period		1,547
Amortization of debt discount	$ 0	(386)
Extinguishment upon conversion of debt		$ (1,161)

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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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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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