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Available-for-Sale Marketable Securities in Unrealized Position (Detail) - Corporate debt securities - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 4,109 $ 5,105
Less than 12 Months, Unrealized Loss (5) (3)
Total, Fair Value 4,109 5,105
Total, Unrealized Loss $ (5) $ (3)