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Certain Balance Sheet Components - Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Raw materials $ 4,179 $ 1,705
Work-in-process 1,633 991
Finished goods 14,080 12,267
Service-related spares 9,150 10,675
Inventories $ 29,042 $ 25,638