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Segments and Major Customers (Tables) | 6 Months Ended
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Jun. 30, 2017
Concentration Risk [Line Items] |
Reported segment revenues, and reported segment direct operating income (loss) | The tables below present reported segment operating income (loss) for the three and six months ended June 30, 2017 and 2016, respectively.
| For the Three Months Ended June 30, 2017 |  | For the Six Months Ended June 30, 2017
| MID |  | RSD |  | Other |  | Total |  | MID |  | RSD |  | Other |  | Total
| (In thousands) |  | (In thousands)
Revenues | $ | 67,402 |  |  | $ | 23,366 |  |  | $ | 3,952 |  |  | $ | 94,720 |  |  | $ | 137,997 |  |  | $ | 46,571 |  |  | $ | 7,503 |  |  | $ | 192,071 |
Segment operating expenses | 23,801 |  |  | 12,214 |  |  | 8,654 |  |  | 44,669 |  |  | 44,056 |  |  | 24,613 |  |  | 17,389 |  |  | 86,058 |
Segment operating income (loss) | $ | 43,601 |  |  | $ | 11,152 |  |  | $ | (4,702 | ) |  | $ | 50,051 |  |  | $ | 93,941 |  |  | $ | 21,958 |  |  | $ | (9,886 | ) |  | $ | 106,013 |
Reconciling items |  |  |  |  |  |  |  |  | (41,807 | ) |  |  |  |  |  |  |  |  |  | (84,335 | )
Operating income |  |  |  |  |  |  |  |  | $ | 8,244 |  |  |  |  |  |  |  |  |  |  | $ | 21,678 |
Interest and other income (expense), net |  |  |  |  |  |  |  |  | (3,132 | ) |  |  |  |  |  |  |  |  |  | (6,184 | )
Income before income taxes |  |  |  |  |  |  |  |  | $ | 5,112 |  |  |  |  |  |  |  |  |  |  | $ | 15,494 |
| For the Three Months Ended June 30, 2016 |  | For the Six Months Ended June 30, 2016
| MID |  | RSD |  | Other |  | Total |  | MID |  | RSD |  | Other |  | Total
| (In thousands) |  | (In thousands)
Revenues | $ | 54,467 |  |  | $ | 16,407 |  |  | $ | 5,627 |  |  | $ | 76,501 |  |  | $ | 108,012 |  |  | $ | 30,508 |  |  | $ | 10,663 |  |  | $ | 149,183 |
Segment operating expenses | 13,229 |  |  | 13,105 |  |  | 7,092 |  |  | 33,426 |  |  | 25,272 |  |  | 25,015 |  |  | 14,218 |  |  | 64,505 |
Segment operating income (loss) | $ | 41,238 |  |  | $ | 3,302 |  |  | $ | (1,465 | ) |  | $ | 43,075 |  |  | $ | 82,740 |  |  | $ | 5,493 |  |  | $ | (3,555 | ) |  | $ | 84,678 |
Reconciling items |  |  |  |  |  |  |  |  | (31,067 | ) |  |  |  |  |  |  |  |  |  | (63,376 | )
Operating income |  |  |  |  |  |  |  |  | $ | 12,008 |  |  |  |  |  |  |  |  |  |  | $ | 21,302 |
Interest and other income (expense), net |  |  |  |  |  |  |  |  | (2,025 | ) |  |  |  |  |  |  |  |  |  | (4,924 | )
Income before income taxes |  |  |  |  |  |  |  |  | $ | 9,983 |  |  |  |  |  |  |  |  |  |  | $ | 16,378 |
Revenue from external customer by geographic regions | Revenue from customers in the geographic regions based on the location of contracting parties was as follows:
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
(In thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
South Korea |  | $ | 28,291 |  |  | $ | 31,632 |  |  | $ | 57,260 |  |  | $ | 63,086 |
USA |  | 41,155 |  |  | 26,532 |  |  | 79,593 |  |  | 51,776 |
Japan |  | 7,057 |  |  | 5,911 |  |  | 13,575 |  |  | 10,898 |
Europe |  | 4,243 |  |  | 4,377 |  |  | 8,681 |  |  | 8,189 |
Canada |  | 1,352 |  |  | 1,168 |  |  | 2,420 |  |  | 1,382 |
Singapore |  | 4,889 |  |  | 4,526 |  |  | 12,636 |  |  | 9,145 |
Asia-Other |  | 7,733 |  |  | 2,355 |  |  | 17,906 |  |  | 4,707 |
Total |  | $ | 94,720 |  |  | $ | 76,501 |  |  | $ | 192,071 |  |  | $ | 149,183 |
Accounts Receivable [Member] |
Concentration Risk [Line Items] |
Schedule of customer accounts representing 10% or more than 10% of total revenue | Accounts receivable from the Company's major customers representing 10% or more of total accounts receivable at June 30, 2017 and December 31, 2016, respectively, was as follows:
|  | As of
Customer |  | June 30, 2017 |  | December 31, 2016
Customer 1 (RSD reportable segment) |  | * |  |  | 17 | %
Customer 2 (Other segment) |  | * |  |  | 12 | %
Customer 3 (MID reportable segment) |  | 20 | % |  | 13 | %
Customer 4 (MID reportable segment) |  | 25 | % |  | * |
_________________________________________ * Customer accounted for less than 10% of total accounts receivable in the period
Sales, net |
Concentration Risk [Line Items] |
Schedule of customer accounts representing 10% or more than 10% of total revenue | Revenue from the Company’s major customers representing 10% or more of total revenue for the three and six months ended June 30, 2017 and 2016, respectively, was as follows:
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
Customer |  | 2017 |  | 2016 |  | 2017 |  | 2016
Customer A (MID and RSD reportable segments) |  | 17 | % |  | 20 | % |  | 17 | % |  | 21 | %
Customer B (MID reportable segment) |  | 13 | % |  | 21 | % |  | 13 | % |  | 21 | %
Customer C (MID reportable segment) |  | 14 | % |  | 13 | % |  | 14 | % |  | 13 | %

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