Convertible Notes and Warrants - Summary of Interest Expense Associated with Convertible Notes (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2016
Noncash Interest Expense
Amortization of debt discount	$ 340	$ 562
Amortization of transaction costs	51	81
Interest expense	898	1,475
Coupon interest expense	$ 507	$ 832

Non cash interest expense.

No definition available.

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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.

+ References

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- Definition

Amount of amortization expense attributable to debt issuance costs.

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- Definition

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

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

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