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Marketable Securities Scheduled Maturities of Available-for-Sale Debt Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]    
Due within one year, amortized cost $ 0 $ 204
Due after one year through five years, amortized cost 1,761 1,537
Total, amortized cost 1,761 1,741
Due within one year, fair value 0 204
Due after one year through five years, fair value 1,773 1,545
Total, fair value $ 1,773 $ 1,749