Other Accrued Expenses and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accrued Liabilities And Other Liabilities Current [Abstract]
Accrued professional fees	$ 562	$ 586
Customer deposits	370	72
Accrued warranties	335	321
Accrued restructuring	759	801
Other accrued expenses	1,617	1,460
Total	$ 3,643	$ 3,240