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ACQUIRED INTANGIBLE ASSETS, NET (Tables)
12 Months Ended
Dec. 31, 2015
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Schedule of Acquired Intangible Assets

Acquired intangible assets, net consisted of the following:

 

   At December 31, 
   2014   2015 
Cost:          
Purchased software  $8,654   $8,471 
Technology licenses   23,154    23,209 
    31,808    31,680 
Accumulated amortization:          
Purchased software   (6,961)   (6,742)
Technology licenses   (7,568)   (10,596)
    (14,529)   (17,338)
Impairment loss recognised:          
Purchased software   (168)   (168)
Technology licenses   (652)   (5,119)
    (820)   (5,287)
           
IPR&D not subject to amortization   420    420 
Less: Impairment loss in respect of IPR&D recognized   (420)   (420)
Acquired intangible assets, net  $16,459   $9,055