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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES New Accounting Pronouncements or change in Accounting Policy (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Accumulated deficit $ (395,871)   $ (395,871)   $ (389,136)
Deferred revenue 1,000   1,000    
Royalty revenue 390 $ 665 710 $ 1,317  
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Accumulated deficit         1,400
Deferred revenue         1,000
Royalties 400   400   $ 400
Royalty revenue 400   400    
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Accrued expenses and current portion of deferred revenue          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Deferred revenue 100   100    
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Other liabilities          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Deferred revenue $ 900   $ 900