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STOCKHOLDERS' EQUITY - Summary of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Stock Options  
Beginning balance, outstanding (in shares) | shares 90
Granted (in shares) | shares 8
Exercised (in shares) | shares (19)
Forfeited (in shares) | shares 0
Ending balance, outstanding (in shares) | shares 79
Exercisable at end of period (in shares) | shares 71
Weighted Average Exercise Price  
Beginning balance, outstanding (in dollars per share) | $ / shares $ 8.91
Granted (in dollars per share) | $ / shares 68.78
Exercised (in dollars per share) | $ / shares 8.36
Forfeited (in dollars per share) | $ / shares 0
Ending balance, outstanding (in dollars per share) | $ / shares 15.41
Exercisable at end of period (in dollars per share) | $ / shares $ 9.06
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value  
Outstanding contractual term (in years) 4 years 7 months 6 days
Exercisable contractual term (in years) 4 years
Outstanding aggregate intrinsic value | $ $ 4,779
Exercisable aggregate intrinsic value | $ $ 4,719