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Segments and Major Customers (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Financial information of business segments |  |
Revenues | $ 48,384 | $ 46,426
Segment operating expenses | 40,683 | 41,365
Segment reconciling items | (39,110) | (48,674)
Operating income (loss) | (31,409) | (43,613)
Interest and other income (expense), net | 5,142 | 4,695
Income (Loss) before income taxes | (26,267) | (38,918)
MID Segment |  |
Financial information of business segments |  |
Revenues | 34,490 | 33,967
Segment operating expenses | 23,979 | 22,949
Segment Operating Income (Loss) | 10,511 | 11,018
RSD Segment |  |
Financial information of business segments |  |
Revenues | 13,894 | 10,018
Segment operating expenses | 14,221 | 12,786
Segment Operating Income (Loss) | (327) | (2,768)
Other |  |
Financial information of business segments |  |
Revenues | 0 | 2,441
Segment operating expenses | 2,483 | 5,630
Segment Operating Income (Loss) | (2,483) | (3,189)
Operating Segments [Member] |  |
Financial information of business segments |  |
Segment Operating Income (Loss) | $ 7,701 | $ 5,061

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