Other Accrued Expenses and Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Accrued Liabilities And Other Liabilities Current [Abstract]
Accrued professional fees	$ 557	$ 586
Customer deposits	174	72
Accrued warranties	352	321
Accrued restructuring	613	801
Rental payments due landlord	541	158
Other accrued expenses	2,300	1,302
Total	$ 4,537	$ 3,240