STOCKHOLDERS' EQUITY - Summary of Stock Option Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) $ / shares shares
Stock Options
Beginning balance, outstanding (in shares)	1,115
Granted (in shares)	0
Exercised (in shares)	(78)
Forfeited (in shares)	(2)
Ending balance, outstanding (in shares)	1,035
Exercisable at end of period (in shares)	702
Unvested at end of period (in shares)	373
Weighted Average Exercise Price
Beginning balance, Outstanding (in USD per share) | $ / shares	$ 6.13
Granted (in USD per share) | $ / shares	0.00
Exercised (in USD per share) | $ / shares	11.01
Forfeited (in USD per share) | $ / shares	4.06
Ending balance, Outstanding (in USD per share) | $ / shares	5.76
Exercisable at end of period (in USD per share) | $ / shares	5.15
Unvested at end of period (in USD per share) | $ / shares	$ 7.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Term, Outstanding	5 years 8 months
Weighted Average Remaining Contractual Term, Exercisable	4 years 6 months 20 days
Weighted Average Remaining Contractual Term, Unvested	8 years 1 month 27 days
Aggregate Intrinsic Value, Outstanding at end of period | $	$ 11,020
Aggregate Intrinsic Value, Exercisable at end of period | $	7,897
Aggregate Intrinsic Value, Unvested at end of period | $	$ 3,280
Market-based Performance Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Percentage of vesting of share-based compensation awards	100.00%
Issuance of additional shares (in shares)	40