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Summary of Gross Realized Gain and Loss from Sale of Available-for-Sale Marketable Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]        
Gross realized gains from sale of available-for-sale marketable securities $ 15 $ 1 $ 15 $ 2
Gross realized losses from sale of available-for-sale marketable securities $ (1) $ (34) $ (31) $ (48)