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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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