INCOME TAXES - SCHEDULE OF INCOME TAX PROVISIONS (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income (loss) before provision for income taxes	$ (4,618)	$ (5,243)	$ 57,798	$ (32,702)
Provision for income taxes	$ (22)	$ (44)	$ (313)	$ (295)
Effective tax rate	(0.50%)	(0.80%)	0.50%	(0.90%)