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Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Accounts Payable and Accrued Liabilities [Line Items] |  |
Payroll and payroll-related expenses | $ 1,120 | $ 1,631
Research and development expenses | 1,132 | 340
Income taxes payable |  | 585
All other | 1,781 | 572
Accrued expenses and other liabilities | $ 4,033 | $ 3,128

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