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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