Accrued Expenses - Components of Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Accrued license milestones	$ 1,000	$ 1,000
Accrued obligations under clinical contracts	3,520	1,957
Accrued legal and professional services	144	152
Accrued VAT expenses	780	780
Accrued interest	21	24
Accrued compensation and benefits	2,402	1,225
Accrued expenses, other	392	386
Total accrued expenses	$ 8,259	$ 5,524

Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. 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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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. 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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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. 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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