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STOCKHOLDERS' EQUITY - Summary of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Stock Options  
Beginning balance, outstanding (in shares) | shares 669
Granted (in shares) | shares 0
Exercised (in shares) | shares (65)
Forfeited (in shares) | shares 0
Ending balance, outstanding (in shares) | shares 604
Exercisable at end of period (in shares) | shares 604
Weighted Average Exercise Price  
Beginning balance, outstanding (in dollars per share) | $ / shares $ 6.37
Granted (in dollars per share) | $ / shares 0.00
Exercised (in dollars per share) | $ / shares 4.00
Forfeited (in dollars per share) | $ / shares 0.00
Ending balance, outstanding (in dollars per share) | $ / shares 6.62
Exercisable at end of period (in dollars per share) | $ / shares $ 6.62
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value  
Weighted Average Remaining Contractual Term, Outstanding 5 years 5 months 13 days
Weighted Average Remaining Contractual Term, Exercisable 5 years 5 months 13 days
Aggregate Intrinsic Value, Outstanding at end of period | $ $ 17,463
Aggregate Intrinsic Value, Exercisable at end of period | $ $ 17,463