LEASES Narrative (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) Lease	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items]
Number of operating leases | Lease	2
Restricted cash	$ 211,000	$ 0	$ 211,000
Weighted average incremental borrowing rate	4.75%
Operating lease, cost	$ 264,000
Cash paid for operating lease liabilities	134,000
Research and development expenses
Lessee, Lease, Description [Line Items]
Operating lease, cost	197,000
Sales, marketing and administration expenses
Lessee, Lease, Description [Line Items]
Operating lease, cost	67,000	$ 142,000
Corporate Headquarters
Lessee, Lease, Description [Line Items]
Deposits			50,000
Restricted cash			211,000
Letter of Credit | Corporate Headquarters
Lessee, Lease, Description [Line Items]
Operating lease deposit, letter of credit	$ 200,000
Letter of credit annual step down of no default payment			$ 50,000
Minimum | Facilities
Lessee, Lease, Description [Line Items]
Operating lease renewal periods	2 years
Maximum | Facilities
Lessee, Lease, Description [Line Items]
Operating lease renewal periods	5 years
Maximum | Facilities and Equipment
Lessee, Lease, Description [Line Items]
Operating lease term	12 months