Other Accrued Expenses and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accrued Liabilities And Other Liabilities Current [Abstract]
Rental payments due landlord	$ 734	$ 158
Accrued professional fees	717	586
Accrued restructuring	411	801
Customer deposits	386	72
Accrued warranties	352	321
Other accrued expenses	1,873	1,302
Total	$ 4,473	$ 3,240