STOCK-BASED COMPENSATION - SCHEDULE OF TIME-BASED STOCK OPTIONS (Detail) - Time Based Stock Option - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Number of Shares Underlying Stock Options
Beginning outstanding balance (in shares)	1,862
Granted (in shares)	269
Exercised (in shares)	(12)
Expired (in shares)	(122)
Ending outstanding balance (in shares)	1,996	1,862
Weighted Average Exercise Price Per Share
Weighted average exercise price, beginning of period (in dollars per share)	$ 9.44
Weighted average exercise price, granted (in dollars per share)	9.82
Weighted average exercise price, exercises (in dollars per share)	6.02
Weighted average exercise price, cancelled or expired (in dollars per share)	9.92
Weighted average exercise price, end of period (in dollars per share)	$ 9.48	$ 9.44
Weighted average remaining contractual life, outstanding	2 years 9 months 9 days	2 years 10 months 6 days
Aggregate intrinsic value, options outstanding	$ 361	$ 751
Number of shares, vested and expected to vest (in shares)	1,996
Weighted average exercise price, vested and expected to vest (in dollars per share)	$ 9.48
Weighted average remaining contractual life, vested and expected to vest	2 years 9 months 9 days
Aggregate intrinsic value of options vested and expected to vest	$ 348
Number of shares, exercisable (in shares)	1,466
Weighted average exercise price, exercisable (in dollars per share)	$ 9,290.00
Weighted average remaining contractual life, exercisable	1 year 6 months 23 days
Aggregate intrinsic value, options exercisable	$ 283