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THE COMPANY AND ITS SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
12 Months Ended
Apr. 01, 2016
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Stock dividend (as a percent) 25.00%    
Number of reportable segments | segment   1  
Cash held in banks, not insured   $ 4,900 $ 4,800
Funds, fully insured   $ 250 250
Minimum      
Estimated useful lives   2 years  
Maximum      
Estimated useful lives   5 years  
China      
Cash held in banks, not insured   $ 1,700 639
Singapore      
Cash held in banks, not insured   $ 676 $ 43