SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES - Revisions to Prior Period Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for income taxes	$ (2,546)			$ (4,313)			$ (3,210)	$ (13,377)
Net income (loss)	$ (7,057)	$ 6,102	$ (24,228)	$ (23,526)	$ (31,341)	$ (12,264)	$ (25,183)	$ (67,131)
Loss per common share:
Basic (in dollars per share)	$ (0.23)			$ (0.78)			$ (0.83)	$ (2.24)
Diluted (in dollars per share)	$ (0.23)			$ (0.78)			$ (0.83)	$ (2.24)
As Previously Reported
Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for income taxes				$ (4,977)				$ (7,331)
Net income (loss)				$ (22,862)				$ (73,177)
Loss per common share:
Basic (in dollars per share)				$ (0.76)				$ (2.44)
Diluted (in dollars per share)				$ (0.76)				$ (2.44)
Adjustments
Prior Period Adjustments Restatement [Line Items]
Provision (benefit) for income taxes				$ 664				$ (6,046)
Net income (loss)				$ (664)				$ 6,046
Loss per common share:
Basic (in dollars per share)				$ (0.02)				$ 0.20
Diluted (in dollars per share)				$ (0.02)				$ 0.20