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Accrued and Other Current Liabilities (Detail) - Accrued And Other Current Liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Accrued liabilities	$ 14,257us-gaap_AccruedLiabilitiesCurrent	$ 8,784us-gaap_AccruedLiabilitiesCurrent
Other current liabilities	640us-gaap_OtherLiabilitiesCurrent	1,638us-gaap_OtherLiabilitiesCurrent
Accrued payroll-related expenses
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Accrued liabilities	9,270	6,791
Accrued expenses
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Accrued liabilities	4,987	1,993
Patent and other assets purchased but not paid
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Other current liabilities	0	563
Other current liabilities
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Other current liabilities	$ 640	$ 1,075

Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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