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Balance Sheet Accounts (Narrative) (Details)
$ in Thousands

12 Months Ended

Dec. 31, 2017

USD ($)

customer

Dec. 31, 2016

USD ($)

customer

Dec. 31, 2015

USD ($)

Balance Sheet Related Disclosures [Abstract]

Depreciation

^[1]

$ 2,837

$ 3,539

$ 4,148

Amortization of acquired intangible assets

^[1],[2]

1,040

1,040

$ 1,153

Concentration Risk [Line Items]

Accounts receivable

^[3]

$ 1,475

$ 1,948

Accounts Receivable | Customer Concentration Risk

Concentration Risk [Line Items]

Number of significant customers | customer

3

4

Concentration Risk, Percentage

61.00%

67.00%

Accounts Receivable | Customer Concentration Risk | Customer One

Concentration Risk [Line Items]

Concentration Risk, Percentage

25.00%

23.00%

Accounts Receivable | Customer Concentration Risk | Customer Two

Concentration Risk [Line Items]

Concentration Risk, Percentage

22.00%

17.00%

Accounts Receivable | Customer Concentration Risk | Customer Three

Concentration Risk [Line Items]

Concentration Risk, Percentage

14.00%

15.00%

Accounts Receivable | Customer Concentration Risk | Customer Four

Concentration Risk [Line Items]

Concentration Risk, Percentage

12.00%

Medicare | Commissions Receivable | Segment Concentration Risk

Concentration Risk [Line Items]

Concentration Risk, Percentage

71.00%

81.00%

[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
[3]	As adjusted for the adoption of ASC 606 using the full retrospective method

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(3))
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