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Other Accrued Expenses and Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accrued Liabilities And Other Liabilities Current [Abstract]    
Accrued professional fees $ 1,454 $ 1,504
Customer deposits 53 1,517
Accrued warranties 433 316
Other accrued expenses 2,225 1,940
Total $ 4,165 $ 5,277