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Operating Segments, Geographic Information and Significant Customers | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Operating Segments, Geographic Information And Significant Customers | Operating Segments, Geographic Information and Significant Customers Operating Segments The following table presents summary results of our operating segments for the year ended December 31, 2015, 2016 and 2017 (in thousands):
| Year Ended December 31,
| 2015 |  | 2016 |  | 2017
Revenue |  |  |  |  |
Medicare | $ | 98,038 |  |  | $ | 122,156 |  |  | $ | 142,448 |
Individual, Family and Small Business | 105,309 |  |  | 71,168 |  |  | 48,258 |
Total revenue | $ | 203,347 |  |  | $ | 193,324 |  |  | $ | 190,706 |
Segment profit |  |  |  |  |
Medicare segment profit | $ | 13,598 |  |  | $ | 10,394 |  |  | $ | 22,137 |
Individual, Family and Small Business segment profit | 38,654 |  |  | 33,050 |  |  | 9,573 |
Total segment profit | 52,252 |  |  | 43,444 |  |  | 31,710 |
Corporate | (25,135 | ) |  | (29,073 | ) |  | (26,970 | )
Stock-based compensation expense | (6,889 | ) |  | (7,266 | ) |  | (9,694 | )
Depreciation and amortization | (4,148 | ) |  | (3,539 | ) |  | (2,837 | )
Restructuring (charge) benefit | (4,541 | ) |  | 297 |  |  | — |
Acquisition costs | — |  |  | — |  |  | (621 | )
Amortization of intangible assets | (1,153 | ) |  | (1,040 | ) |  | (1,040 | )
Other income, net | 1,285 |  |  | 1,149 |  |  | 1,182 |
Income (loss) before provision (benefit) for income taxes | $ | 11,671 |  |  | $ | 3,972 |  |  | $ | (8,270 | )
There are no internal revenue transactions between our operating segments. Our CODM does not separately evaluate assets by segment, and therefore assets by segment are not presented. Geographic Information Our long-lived assets consisted primarily of property and equipment, internally-developed software, goodwill and other indefinite-lived intangible assets and finite-lived intangible assets. Our long-lived assets are attributed to the geographic location in which they are located. Long-lived assets by geographical area as of December 31, 2016 and December 31, 2017 were as follows (in thousands):
| December 31, 2016 |  | December 31, 2017
United States | $ | 32,162 |  |  | $ | 32,876 |
China | 391 |  |  | 550 |
Total | $ | 32,553 |  |  | $ | 33,426 |
Significant Customers Substantially all revenue for the years ended December 31, 2015, 2016 and 2017 was generated from customers located in the United States. Carriers representing 10% or more of our total revenue for the years ended December 31, 2015, 2016 and 2017 are presented in the table below:
| Year Ended December 31,
| 2015 |  | 2016 |  | 2017
Humana | 23 | % |  | 22 | % |  | 20 | %
UnitedHealthcare 1 | 12 | % |  | 19 | % |  | 23 | %
Aetna 2 | 11 | % |  | 11 | % |  | 10 | %
(1) | UnitedHealthcare also includes other carriers owned by UnitedHealthcare.
(2) | Aetna includes other carriers owned by Aetna.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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