LEASES - Future Minimum Commitments Due (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Future Minimum Lease Payments
2018 (remaining three months)	$ 132
2019	86
Present value adjustment	(2)
Total minimum lease payments	216
Watertown Lease | Operating Lease Obligations
Future Minimum Lease Payments
2018 (remaining three months)	69
2019	34
Present value adjustment	(2)
Total minimum lease payments	101
Waverley Oaks Lease | Short-Term Lease Obligations
Future Minimum Lease Payments
2018 (remaining three months)	63
2019	52
Total minimum lease payments	$ 115