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Balance Sheet Details - Summary of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accrued Liabilities Current [Abstract]    
Accrued salaries, wages and benefits $ 1,309 $ 1,920
Other accrued expenses 717 1,183
Accrued expenses $ 2,026 $ 3,103