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Available-for-Sale Debt Securities by Original Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]    
One year or less, amortized cost $ 69,843 $ 43,822
Greater than one year and less than five years, amortized cost 42,784 15,656
Amortized Cost 112,627 59,478
One year or less, fair value 70,200 43,907
Greater than one year and less than five years, fair value 43,334 15,685
Total available-for-sale securities fair value $ 113,534 $ 59,592