Other Accrued Expenses and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accrued Liabilities And Other Liabilities Current [Abstract]
Accrued professional fees	$ 484	$ 1,511
Customer deposits	203	137
Accrued warranties	474	407
Earnout liability		750
Other accrued expenses	1,596	1,693
Total	$ 2,757	$ 4,498