Convertible Notes Payable and Related Transactions - Reconciliation of Principal Amounts of Acacia Note and the Bridge Loan to Convertible Notes Payable (Detail) $ in Thousands	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Debt discounts associated with stock warrants, net	$ (6,793)
Debt issuance costs, net	(105)
Accrued interest	286
Convertible note payable	13,388
First Loans [Member]
Debt Instrument [Line Items]
Borrowings	10,000
Second Loans [Member]
Debt Instrument [Line Items]
Borrowings	$ 10,000

Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ 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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No definition available.

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, after accumulated amortization, of debt issuance costs classified as current. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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