STOCKHOLDERS' EQUITY - Summary of Stock Option Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) $ / shares shares
Stock Options
Beginning balance, outstanding (in shares) | shares	669
Granted (in shares) | shares	0
Exercised (in shares) | shares	(571)
Forfeited (in shares) | shares	0
Ending balance, outstanding (in shares) | shares	98
Exercisable at end of period (in shares) | shares	98
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	5.88
Forfeited (in dollars per share) | $ / shares	0
Ending balance, outstanding (in dollars per share) | $ / shares	9.20
Exercisable at end of period (in dollars per share) | $ / shares	$ 9.20
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Outstanding contractual term at end of period	6 years 1 month 6 days
Exercisable contractual term at end of period	6 years 1 month 6 days
Outstanding aggregate intrinsic value at end of period | $	$ 3,311
Exercisable aggregate intrinsic value at end of period | $	$ 3,311