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COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Balance Sheet Related Disclosures [Abstract] |  |
Prepaid legal fees | $ 1,906 | $ 181
Prepaid income tax | 4,028 | 3,081
Prepaid maintenance agreements | 1,062 | 2,047
Interest receivable | 1,286 | 595
Advance to suppliers | 3,074 | 2,157
Other | 3,960 | 3,854
Total | $ 15,316 | $ 11,915

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