SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES - Revisions to Prior Period Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for income taxes	$ (997)		$ (4,106)		$ (664)	$ (9,064)
Net income (loss)	$ 6,102	$ (24,228)	$ (31,341)	$ (12,264)	$ (18,126)	$ (43,605)
Basic loss per share	$ 0.20		$ (1.04)		$ (0.60)	$ (1.45)
Diluted loss per share	$ 0.20		$ (1.04)		$ (0.60)	$ (1.45)
As Previously Reported
Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for income taxes			$ (2,977)			$ (2,354)
Net income (loss)			$ (32,470)			$ (50,315)
Basic loss per share			$ (1.08)			$ (1.68)
Diluted loss per share			$ (1.08)			$ (1.68)
Adjustments
Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for income taxes			$ (1,129)			$ (6,710)
Net income (loss)			$ 1,129			$ 6,710
Basic loss per share			$ 0.04			$ 0.23
Diluted loss per share			$ 0.04			$ 0.23