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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, 2018
USD ($)
$ / shares
shares
Stock Options  
Beginning balance, outstanding (in shares) 727
Granted (in shares) 0
Exercised (in shares) (98)
Forfeited (in shares) 0
Ending balance, outstanding (in shares) 629
Exercisable at end of period (in shares) 429
Unvested at end of period (in shares) 240
Weighted Average Exercise Price  
Beginning balance, outstanding (in dollars per share) | $ / shares $ 5.82
Granted (in dollars per share) | $ / shares 0.00
Exercised (in dollars per share) | $ / shares 4.80
Forfeited (in dollars per share) | $ / shares 0.00
Ending balance, outstanding (in dollars per share) | $ / shares 5.98
Exercisable at end of period (in dollars per share) | $ / shares 4.81
Unvested at end of period (in dollars per share) | $ / shares $ 9.16
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value  
Weighted Average Remaining Contractual Term, Outstanding 5 years 8 months 13 days
Weighted Average Remaining Contractual Term, Exercisable 4 years 11 months
Weighted Average Remaining Contractual Term, Unvested 7 years 6 months
Aggregate Intrinsic Value, Outstanding at end of period | $ $ 15,765
Aggregate Intrinsic Value, Exercisable at end of period | $ 11,253
Aggregate Intrinsic Value, Unvested at end of period | $ $ 5,256
Market-based Performance Stock Options  
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value  
Percentage of vesting of share-based compensation awards 100.00%
Issuance of additional shares (in shares) 40