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Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt, Principal	$ 30,000
Less: debt-current	(3,572)
Debt-non-current	26,262	$ 29,798
Cerus Term Loans
Debt Instrument [Line Items]
Total debt, Principal	30,000	30,000
Total debt, Unamortized Discount	(166)	(202)
Total debt	29,834	29,798
Less: debt - current, Principal	(3,572)
Less: debt-current	(3,572)
Debt - non-current, Principal	26,428	30,000
Debt - non-current, Unamortized Discount	(166)	(202)
Debt-non-current	$ 26,262	$ 29,798

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- Definition

Current portion carrying value of the debt instrument before deducting unamortized discounts (if any).

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Non-current portion carrying value of the debt instrument before deducting unamortized discounts (if any).

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Non-current portion of the unamortized discounts on the debt instrument.

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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.

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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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Amount, after accumulated amortization, of debt discount.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Carrying value as of the balance sheet date of the portion of long-term, collateralized debt obligations due within one year or the operating cycle, if longer. Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

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