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COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]    
Prepaid legal fees $ 151 $ 213
Prepaid income tax 864 460
Prepaid maintenance agreements 1,695 856
Interest receivable 690 1,195
Advance to suppliers 2,546 1,211
Other 4,673 3,823
Total $ 10,619 $ 7,758