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Summary of Potential Number of Shares that Could Vest Under Restricted Stock Unit Awards (Detail) $ in Thousands | 6 Months Ended
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Jun. 30, 2020 USD ($) shares
Disclosure Of Restricted Stock Unit [Abstract] |
Number of shares vesting at IRR of at least 6% | shares | 190,707
Number of shares vesting at IRR of at least 8% | shares | 286,060
Number of shares vesting at IRR of at least 14% | shares | 436,681
Value at grant at IRR of at least 6% | $ | $ 6,125
Value at grant at IRR of at least 8% | $ | 9,188
Value at grant at IRR of at least 14% | $ | $ 14,026

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