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Other Accrued Liabilities
 6 Months Ended
Jun. 30, 2011
Other Accrued Liabilities [Abstract]  
Other Accrued Liabilities
4. Other Accrued Liabilities
     Other accrued liabilities consisted of the following (in thousands):
                 
    June 30,     December 31,  
    2011     2010  
Deferred revenue
  $ 6,914     $ 8,617  
Accrued health insurance
    5,268       4,970  
Deferred rent
    3,780       3,456  
Accrued consulting fees
    2,760       2,760  
Holdbacks and earnouts
    2,600       2,447  
Customer deposits
    1,939       2,966  
Accrued lab service rebates
    132       2,535  
Other
    18,253       18,018  
 
           
 
  $ 41,646     $ 45,769