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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, 2017
USD ($)
$ / shares
shares
Stock Options  
Beginning balance, outstanding (in shares) 1,115
Granted (in shares) 0
Exercised (in shares) (91)
Forfeited (in shares) (5)
Ending balance, outstanding (in shares) 1,019
Exercisable at end of period (in shares) 819
Unvested at end of period (in shares) 240
Weighted Average Exercise Price  
Beginning balance, Outstanding (in dollars per share) | $ / shares $ 6.13
Granted (in dollars per share) | $ / shares 0.00
Exercised (in dollars per share) | $ / shares 10.97
Forfeited (in dollars per share) | $ / shares 7.54
Beginning balance, Outstanding (in dollars per share) | $ / shares 5.68
Exercisable at end of period (in dollars per share) | $ / shares 5.00
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 6 months
Weighted Average Remaining Contractual Term, Exercisable 4 years 9 months 20 days
Weighted Average Remaining Contractual Term, Unvested 8 years 5 months 27 days
Aggregate Intrinsic Value, Outstanding at end of period | $ $ 13,366
Aggregate Intrinsic Value, Exercisable at end of period | $ 11,305
Aggregate Intrinsic Value, Unvested at end of period | $ $ 2,313
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