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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Contract assets:      
Unbilled receivables $ 7,226 $ 4,850 $ 7,521
Contract liabilities:      
Customer advances and unearned income 4,681 3,372 3,414
Unearned event income $ 4,100 $ 4,117 $ 1,370