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Stock-Based Compensation - Schedule of Unvested Performance Restricted Stock Unit (Detail) - Performance Restricted Stock Units [Member]
shares in Thousands
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Number of Shares  
Unvested, beginning balance | shares 124
Granted | shares 0
Vested | shares (82) [1]
Forfeited | shares (42)
Unvested, ending balance | shares 0
Weighted Average Grant Date Fair Value  
Unvested, beginning balance | $ / shares $ 11.08
Granted | $ / shares 0
Vested | $ / shares 15.54 [1]
Forfeited | $ / shares 11.08
Unvested, ending balance | $ / shares $ 0
[1] Includes the impact of the modification of 21 PRSUs which were cancelled and reissued at a grant date fair value of $28.93