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Balance Sheet Accounts (Schedule of Intangible Asset Future Amortization Expense) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
2019 $ 2,187  
2020 1,493  
2021 535  
2022 480  
2023 480  
Thereafter 1,960  
Total 7,135 $ 2,426
Technology    
Finite-Lived Intangible Assets [Line Items]    
2019 667  
2020 667  
2021 55  
2022 0  
2023 0  
Thereafter 0  
Total 1,389 0
Pharmacy and customer relationships    
Finite-Lived Intangible Assets [Line Items]    
2019 950  
2020 316  
2021 0  
2022 0  
2023 0  
Thereafter 0  
Total 1,266 2,216
Trade names, trademarks and website addresses    
Finite-Lived Intangible Assets [Line Items]    
2019 570  
2020 510  
2021 480  
2022 480  
2023 480  
Thereafter 1,960  
Total $ 4,480 $ 210