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Fair Value Measurement (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Assets:    
Marketable securities $ 54,291 $ 48,266
Foreign exchange contracts 219 9
Government bonds    
Assets:    
Marketable securities 500  
Certificates of deposits    
Assets:    
Marketable securities 1 1
Corporate bonds    
Assets:    
Marketable securities 53,790 48,265
Level II    
Assets:    
Foreign exchange contracts 219 9
Level II | Government bonds    
Assets:    
Marketable securities 500  
Level II | Certificates of deposits    
Assets:    
Marketable securities 1 1
Level II | Corporate bonds    
Assets:    
Marketable securities $ 53,790 $ 48,265