SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Reimbursable Third-Party Patent Costs, Third party Royalties and Royalty Buy-Down (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Payment	Mar. 31, 2017 USD ($)	Mar. 31, 2012 USD ($) Payment	Dec. 31, 2017 USD ($)
Reimbursable Third-Party Patent Costs [Abstract]
Accrued patent costs	$ 134			$ 0
Third-Party Royalties [Abstract]
Royalty expenses	500	$ 500
Royalty Buy-Down [Abstract]
Initial payment for royalty buy down	$ 600		$ 1,500
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
Deferred royalty buy-down	$ 1,600			$ 2,500