SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Reimbursable Third-Party Patent Costs, Third party Royalties and Royalty Buy-Down (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2012 USD ($) Payment	Jun. 30, 2018 USD ($) Payment	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Reimbursable Third-Party Patent Costs [Abstract]
Accrued patent costs	$ 49			$ 49		$ 0
Third-Party Royalties [Abstract]
Royalty expenses	500	$ 400		1,000	$ 900
Royalty Buy-Down [Abstract]
Initial payment for royalty buy down			$ 1,500	$ 600
Number of additional cash payments for royalty buy-down | Payment			5
Number of cash payments made for royalty obligation | Payment				5
Deferred costs, amortization period				5 years
Amount amortized related to agreement	500	$ 400		$ 1,000	$ 700
Deferred royalty buy-down	$ 1,100			$ 1,100		$ 2,500