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Notes Payable - Schedule of Notes Payable (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Equity Method Investments And Cost Method Investments [Abstract]
Notes payable	$ 7,500	$ 7,500
Less: current portion	(2,820)	(1,381)
Notes payable, net of current portion	4,680	6,119
Debt discount, net of accretion	(56)	(79)
Accretion related to final payment	227	137
Notes payable, net of discount, long term	$ 4,851	$ 6,177

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Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

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- Definition

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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Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.

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Equity Method Investments And Cost Method Investments [Abstract]

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The net amount of total notes payable less the current portion of notes payable.

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