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Balance Sheet Accounts - Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Raw materials $ 2,074 $ 3,349
Work in process 1,182 1,244
Finished goods 20,496 20,252
Inventory, gross $ 23,752 $ 24,845