LEASES - Quantitative Information of Operating Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Operating leases:
Operating lease cost	$ 2,430
Variable lease cost	66
Operating lease expense	2,496
Short-term lease expense	1,830
Total lease expense	4,326
Cash paid for amounts included in the lease liability - operating cash flows from operating leases	2,440
Right of use assets obtained in exchange for operating lease liabilities	$ 18,771