Other Accrued Expenses and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accrued Liabilities And Other Liabilities Current [Abstract]
Accrued professional fees	$ 586	$ 1,511
Customer deposits	72	137
Accrued warranties	321	407
Earnout liability		750
Accrued restructuring	801
Other accrued expenses	1,460	1,693
Total	$ 3,240	$ 4,498