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Stockholder's Equity (Schedule of Option Activity Under Stock Plans) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Number of Stock Options

Balance outstanding at December 31, 2018 (in shares)

1,005

Common stock options

Number of Stock Options

Balance outstanding at December 31, 2017 (in shares)

^[1]

983

Granted (in shares)

^[1]

317

Exercised (in shares)

^[1]

(165)

Cancelled (in shares)

^[1]

(130)

Balance outstanding at December 31, 2018 (in shares)

^[1]

1,005

983

Vested and expected to vest at December 31, 2018 (in shares)

^[1]

953

Exercisable at December 31, 2018 (in shares)

^[1]

451

Weighted Average Exercise Price

Balance outstanding at December 31, 2017, weighted average exercise price (in usd per share)

$ 17.38

Granted, weighted average exercise price (in usd per share)

23.42

Exercised, weighted average exercise price (in usd per share)

16.69

Cancelled, weighted average exercise price (in usd per share)

24.37

Balance outstanding at December 31, 2018, weighted average exercise price (in usd per share)

18.34

$ 17.38

Vested and expected to vest at December 31, 2018, weighted average exercise price (in usd per share)

18.13

Exercisable at December 31, 2018, weighted average exercise price (in usd per share)

$ 16.40

Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]

Weighted-average remaining contractual life (years), balance outstanding

5 years

4 years 7 months 6 days

Weighted-average remaining contractual life (years), vested and expected to Vest

4 years 10 months 25 days

Weighted-average remaining contractual life (years), exercisable

3 years 10 months 25 days

Aggregate intrinsic value, balance outstanding

^[2]

$ 20,226

$ 2,522

Aggregate intrinsic value, vested and expected to vest

^[2]

19,390

Aggregate intrinsic value, exercisable

^[2]

$ 9,987

Weighted average fair value of options granted (in usd per share)

$ 12.78

$ 9.03

$ 4.46

Total fair value of options vested

$ 2,263

$ 799

$ 1,243

Intrinsic value of options exercised

$ 1,461

$ 430

$ 4

[1]	Includes certain stock options with service, performance-based or market-based vesting criteria.
[2]	The aggregate intrinsic value is calculated as the product between eHealth’s closing stock price as of December 31, 2018 and December 31, 2017 at the exercise price of in-the-money options as of those dates.

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