STOCK-BASED COMPENSATION - SCHEDULE OF TIME-BASED STOCK OPTIONS (Detail) - Time Based Stock Option $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
Number of Shares Underlying Stock Options
Beginning outstanding balance (in shares) | shares	1,862
Granted (in shares) | shares	369
Exercised (in shares) | shares	(62)
Cancelled or expired (in shares) | shares	(406)
Ending outstanding balance (in shares) | shares	1,763	1,862
Weighted Average Exercise Price Per Share
Weighted average exercise price, beginning of period (in dollars per share) | $ / shares	$ 9.44
Weighted average exercise price, granted (in dollars per share) | $ / shares	9.13
Weighted average exercise price, exercises (in dollars per share) | $ / shares	6.01
Weighted average exercise price, cancelled or expired (in dollars per share) | $ / shares	10.02
Weighted average exercise price, end of period (in dollars per share) | $ / shares	$ 9.36	$ 9.44
Weighted average remaining contractual life, outstanding	2 years 1 month 6 days	2 years 10 months 6 days
Aggregate intrinsic value, options outstanding | $	$ 88	$ 751
Number of shares, vested and expected to vest (in shares) | shares	1,763
Weighted average exercise price, vested and expected to vest (in dollars per share) | $ / shares	$ 9.36
Weighted average remaining contractual life, vested and expected to vest	2 years 1 month 6 days
Aggregate intrinsic value of options vested and expected to vest | $	$ 88
Number of shares, exercisable (in shares) | shares	1,324
Weighted average exercise price, exercisable (in dollars per share) | $ / shares	$ 9.46
Weighted average remaining contractual life, exercisable	8 months 5 days
Aggregate intrinsic value, options exercisable | $	$ 29