LEASES - Summary of Lease Expense and Weighted Average (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 1,467	$ 2,730
Short-term lease cost	9	48
Total lease cost	$ 1,476	$ 2,778
Weighted average remaining lease term	4 years 2 months 12 days	4 years 2 months 12 days
Weighted average discount rate	5.00%	5.00%