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Operating Segments, Geographic Information and Significant Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 83,118 | $ 31,466 | $ 34,566 | $ 41,556 | $ 77,415 | $ 28,642 | $ 35,856 | $ 51,411 | $ 190,706 | [1] | $ 193,324 | [1] | $ 203,347 | [1]
Stock-based compensation expense |  |  |  |  |  |  |  |  |  | (9,694) |  | (7,266) |  | (6,889) |
Depreciation and amortization | [2] |  |  |  |  |  |  |  |  | (2,837) |  | (3,539) |  | (4,148) |
Restructuring benefit | [1] |  |  |  |  |  |  |  |  | 0 |  | 297 |  | (4,541) |
Acquisition costs |  |  |  |  |  |  |  |  |  | (621) |  | 0 |  | 0 |
Amortization of intangible assets | [1],[2] |  |  |  |  |  |  |  |  | (1,040) |  | (1,040) |  | (1,153) |
Other income, net | [1] |  |  |  |  |  |  |  |  | 1,182 |  | 1,149 |  | 1,285 |
Income (loss) before provision (benefit) for income taxes | [1] |  |  |  |  |  |  |  |  | (8,270) |  | 3,972 |  | 11,671 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 190,706 |  | 193,324 |  | 203,347 |
Segment profit (loss) |  |  |  |  |  |  |  |  |  | 31,710 |  | 43,444 |  | 52,252 |
Operating Segments | Medicare Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 142,448 |  | 122,156 |  | 98,038 |
Segment profit (loss) |  |  |  |  |  |  |  |  |  | 22,137 |  | 10,394 |  | 13,598 |
Operating Segments | Individual, Family and Small Business Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 48,258 |  | 71,168 |  | 105,309 |
Segment profit (loss) |  |  |  |  |  |  |  |  |  | 9,573 |  | 33,050 |  | 38,654 |
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment profit (loss) |  |  |  |  |  |  |  |  |  | $ (26,970) |  | $ (29,073) |  | $ (25,135) |
[1] | As adjusted for the adoption of ASC 606 using the full retrospective method
[2] | As adjusted for the adoption of ASC 606 using the full retrospective method

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