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COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Balance Sheet Related Disclosures [Abstract] |  |
Prepaid legal fees | $ 1,866 | $ 181
Prepaid income tax | 4,481 | 3,081
Prepaid maintenance agreements | 2,161 | 2,047
Interest receivable | 457 | 595
Advance to suppliers | 3,590 | 2,157
Other | 4,243 | 3,854
Total | $ 16,798 | $ 11,915

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