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Stockholders' Equity - Schedule of Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs) [Member]
shares in Thousands
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Unvested, Beginning Balance | shares 642
Number of Shares, Granted | shares 268
Number of Shares, Vested | shares (242)
Number of Shares, Forfeited | shares (61)
Number of Shares, Unvested, Ending Balance | shares 607
Weighted-Average Grant Date Fair Value, Unvested, Beginning Balance | $ / shares $ 38.99
Weighted-Average Grant Date Fair Value, Granted | $ / shares 45.23
Weighted-Average Grant Date Fair Value, Vested | $ / shares 39.91
Weighted-Average Grant Date Fair Value, Forfeited | $ / shares 39.57
Weighted-Average Grant Date Fair Value, Unvested, Ending Balance | $ / shares $ 41.33