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Supplemental Balance Sheet Information - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 635 $ 539
Work-in-process 1,066 562
Finished goods 381 243
Total inventories, net $ 2,082 $ 1,344