Balance Sheet Details - Summary of Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Salaries and benefits	$ 3,651	$ 4,061
Restructuring	1,978	8
Pennsylvania grant liability	1,000
Royalties and revenue sharing	803	544
Income taxes	176	167
Marketing expenses, rebates and other	126	49
Total accrued liabilities	$ 7,734	$ 4,829

Carrying value as of the balance sheet date of obligations incurred through that date and payable for royalties. 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 the obligations incurred through that date and payable for employees' services provided. 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 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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