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Balance Sheet Accounts (Schedule of Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | $ 12,707 | $ 12,707
Accumulated Amortization |  | (10,281) | (9,241)
Total finite-lived intangible assets, net |  | 2,426 | 3,466
Indefinite-lived trademarks and domain names |  | 5,114 | 5,114
Intangible assets | [1] | 7,540 | 8,580
Technology |  |  |
Schedule Of Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | 1,700 | 1,700
Accumulated Amortization |  | (1,700) | (1,700)
Total finite-lived intangible assets, net |  | $ 0 | 0
Weighted Average Remaining Life |  | 0 years |
Pharmacy And Customer Relationships |  |  |
Schedule Of Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | $ 10,100 | 10,100
Accumulated Amortization |  | (7,884) | (6,934)
Total finite-lived intangible assets, net |  | $ 2,216 | 3,166
Weighted Average Remaining Life |  | 2 years 4 months |
Trade Names, Trademarks and Website Addresses |  |  |
Schedule Of Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | $ 907 | 907
Accumulated Amortization |  | (697) | (607)
Total finite-lived intangible assets, net |  | $ 210 | $ 300
Weighted Average Remaining Life |  | 2 years 4 months |
[1] | As adjusted for the adoption of ASC 606 using the full retrospective method

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