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Additional Information with Respect to Non-vested Options (Detail) - Employee Stock Option
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Weighted-average remaining contractual term 6 years 8 months 15 days
Weighted-average remaining expected term 1 year 8 months 15 days
Weighted-average remaining vesting period 1 year 8 months 15 days
Unrecognized compensation cost $ 151