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DSIT Solutions, Ltd. ('DSIT') - Schedule of Equity Investment Balance in DSIT (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Net income (loss) before income taxes for reportable segments    
Balance at the Beginning $ 5,800 $ 5,658
Acorn's share of net income in DSIT 33 450
Impairment (33) (308)
Sale of Investment in DSIT (5,800)  
Balance at the ending $ 5,800