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FAIR VALUE MEASUREMENTS - EQUITY INVESTMENT (Details) - Sienna - Equity Investment - USD ($)
12 Months Ended
Aug. 03, 2017
Dec. 31, 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   $ 585,000      
Change in fair value of equity investment   604,000      
Loss related to foreign currency translation   $ 63,000      
Accounting Standards Update 2016-01 and 2018-03          
Equity Investments [Line Item]          
Cumulative effect adjustment     $ 1,189,000