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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, 2018 | Dec. 31, 2017
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Balance Sheet Related Disclosures [Abstract] |  |
Prepaid legal fees | $ 1,917 | $ 213
Prepaid income tax | 996 | 460
Prepaid maintenance agreements | 1,630 | 856
Interest receivable | 457 | 1,195
Advance to suppliers | 2,867 | 1,211
Other | 4,706 | 3,823
Total | $ 12,573 | $ 7,758

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