LEASES - Future Minimum Rent Commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Jul. 31, 2016
Leases [Abstract]
2019	$ 2,250
2020	2,958
2021	2,486
2022	2,560
2023	2,637
Thereafter	1,585
Total future minimum rent commitments	14,476	$ 14,000
Present value discount	(2,530)
Total lease liability	11,946	11,300
Lease incentives	(1,702)	(1,800)	$ (2,300)
Straight line lease expense in excess of cash payments	(1,635)
Total ROU asset	$ 8,609	$ 7,900