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Patents (Tables)
 12 Months Ended
Dec. 31, 2011
Patents [Abstract]  
Patents
Acacia’s only identifiable intangible assets are patents and patent rights, with estimated remaining economic useful lives ranging from one to seven years.  The gross carrying amounts and accumulated amortization related to acquired intangible assets as of December 31, 2011 and 2010 are as follows (in thousands): 
 
 
2011
 
2010
 
 
 
 
 
Gross carrying amount - patents                                                                             
 
$
61,519

 
$
51,001

Accumulated amortization - patents                                                                             
 
(36,331
)
 
(31,198
)
Patents, net                                                                             
 
$
25,188

 
$
19,803