SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Third party Royalties and Royalty Buy-Down (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jan. 31, 2014	Mar. 31, 2012 USD ($) payment
Third-Party Royalties
Royalty expenses	$ 100	$ 200	$ 200	$ 600
Royalty Buy-Down
Deferred royalty buy-down						$ 1,500
Deferred royalty buy-down, number of additional cash payments | payment						5
Deferred royalty buy-down, five additional capitalized cost						$ 600
Deferred costs, amortization period	5 years		5 years		5 years
Deferred royalty buy-down, amortization expense		$ 0		$ 200