ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
ACCRUED EXPENSES.
Severance and restructuring	$ 191	$ 517
Compensation	479	489
Clinical	37	73
Legal	67	35
Other accrued expenses	119	176
Total accrued expenses	$ 893	$ 1,290