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FAIR VALUE MEASUREMENTS - EQUITY INVESTMENT (Details) - Sienna - Equity Investment - USD ($)
3 Months Ended 9 Months Ended
Aug. 03, 2017
Sep. 30, 2018
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2007
Equity Investments [Line Item]            
Number of shares owned           13,842,625
Cost method investments cost basis         $ 0 $ 0
Trading restriction period 24 months          
Fair value of equity investment   $ 851,000 $ 851,000      
Change in fair value of equity investment   175,000 (338,000)      
Loss related to foreign currency translation   $ 30,000 $ 68,000      
Accounting Standards Update 2016-01 and 2018-03            
Equity Investments [Line Item]            
Cumulative effect adjustment       $ 1,189,000