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Balance Sheet Components - Summary of Inventory (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 2,348 $ 2,569
Work in progress 1,428 1,471
Raw materials 1,235 1,489
Total inventory $ 5,011 $ 5,529