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Stock-Based Compensation - Reconciliation of Unvested Balance of Performance Restricted Stock Unit (Detail) - Performance Restricted Stock Units [Member]
shares in Thousands
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Number of Shares  
Unvested, beginning balance | shares 124
Granted | shares 0
Vested | shares 0
Forfeited | shares 0
Unvested, ending balance | shares 124
Weighted Average Grant Date Fair Value  
Unvested, beginning balance | $ / shares $ 11.08
Granted | $ / shares 0
Vested | $ / shares 0
Forfeited | $ / shares 0
Unvested, ending balance | $ / shares $ 11.08