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REVENUE RECOGNITION AND CONTRACT WITH CUSTOMERS - Schedule of New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Liabilities      
Deferred revenue   $ 0  
Equity      
Accumulated deficit $ (324,298) (306,813) $ (306,813)
Calculated under Revenue Guidance in Effect before Topic 606      
Liabilities      
Deferred revenue     2,474
Equity      
Accumulated deficit     $ (309,287)
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09      
Equity      
Accumulated deficit   2,474  
Transferred over Time | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09      
Liabilities      
Deferred revenue   $ (2,474)