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Fair Value Hierarchy for Financial Assets Measured at Fair Value on a Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Money market funds$ 23,281[1]$ 39,283[1]
Assets, Fair Value Disclosure23,28139,283
Level 1
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Money market funds23,281[1]39,283[1]
Assets, Fair Value Disclosure$ 23,281$ 39,283
[1]Included in "Cash and cash equivalents" in the consolidated balance sheets as of September 30, 2011 and December 31, 2010 in addition to $11.0 million and $20.3 million, respectively, of cash. Unrealized gains and losses on money market funds were nominal due to the short-term nature of the investments.