SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019
Lease, Practical Expedients, Package [true false]	true
Operating lease costs	$ 20
Variable lease costs	1
Cash paid for amounts in the measurement of lease liabilities	$ 65
Weighted average life remaining for operating leases	1 year 9 months 18 days
Operating lease, weighted average discount rate (as a percent)	10.00%
ASU 2016-02
Operating lease ROU assets		$ 200
Operating lease liability		$ 200