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Balance Sheet Components - Schedule of Inventory (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Investments Schedule [Abstract]
Raw materials	$ 797
Work-in-progress	1,035
Finished goods	149
Total inventories	$ 1,981	$ 0

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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