LEASES - Balance sheet information related to leases (Details) $ in Thousands	Mar. 31, 2019 USD ($)
LEASES
Operating lease assets	$ 5,388
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Operating lease assets
Finance lease assets	$ 1,358
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, Plant and Equipment, Net
Total leased assets	$ 6,745
Current operating lease liabilities	$ 811
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Current operating lease liabilities
Current finance lease liabilities	$ 359
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Current finance lease liabilities
Long-term operating lease liabilities	$ 4,813
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-term operating lease liabilities
Long term finance lease liabilities	$ 864
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long term finance lease liabilities
Total lease liabilities	$ 6,847