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STOCKHOLDERS' EQUITY - Summary of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Stock Options  
Beginning balance, outstanding (in shares) | shares 669
Granted (in shares) | shares 0
Exercised (in shares) | shares (378)
Forfeited (in shares) | shares 0
Ending balance, outstanding (in shares) | shares 291
Exercisable at end of period (in shares) | shares 291
Weighted Average Exercise Price  
Beginning balance, outstanding (in dollars per share) | $ / shares $ 6.37
Granted (in dollars per share) | $ / shares 0
Exercised (in dollars per share) | $ / shares 6.03
Forfeited (in dollars per share) | $ / shares 0
Ending balance, outstanding (in dollars per share) | $ / shares 6.80
Exercisable at end of period (in dollars per share) | $ / shares $ 6.80
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value  
Weighted Average Remaining Contractual Term, Outstanding 5 years 4 months 24 days
Weighted Average Remaining Contractual Term, Exercisable 5 years 4 months 24 days
Aggregate Intrinsic Value, Outstanding at end of period | $ $ 9,557
Aggregate Intrinsic Value, Exercisable at end of period | $ $ 9,557