LEASES - Additional Information (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Leases [Abstract]
Right-of-Use asset	$ 10,436	$ 10,436
Operating lease liability	11,522	11,522
Operating lease, liability, current	2,016	2,016
Operating lease, liability, noncurrent	9,506	9,506
Operating lease cost	$ 751	$ 1,436
Weighted average remaining lease term (in years)	9 years 23 days	9 years 23 days
Weighted average discount rate (as a percent)	5.20%	5.20%