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Balance Sheet Accounts (Schedule of Intangible Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Intangible Assets [Line Items]    
Gross Carrying Amount $ 17,200 $ 12,707
Accumulated Amortization (10,065) (10,281)
Total 7,135 2,426
Indefinite-lived trademarks and domain names 5,114 5,114
Intangible assets 12,249 7,540 [1]
Technology    
Schedule Of Intangible Assets [Line Items]    
Gross Carrying Amount 2,000 1,700
Accumulated Amortization (611) (1,700)
Total $ 1,389 0
Weighted-average remaining useful life 2 years 1 month 6 days  
Pharmacy and customer relationships    
Schedule Of Intangible Assets [Line Items]    
Gross Carrying Amount $ 9,500 10,100
Accumulated Amortization (8,234) (7,884)
Total $ 1,266 2,216
Weighted-average remaining useful life 1 year 3 months 19 days  
Trade names, trademarks and website addresses    
Schedule Of Intangible Assets [Line Items]    
Gross Carrying Amount $ 5,700 907
Accumulated Amortization (1,220) (697)
Total $ 4,480 $ 210
Weighted-average remaining useful life 8 years 10 months 25 days  
[1] As adjusted for the adoption of ASC 606 using the full retrospective method.