Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Revenue Recognition [Abstract]
Revenue recognized from contract liability			$ 100	$ 400
Contract With Customer Liability Revenue Recognized Extended Warranty			900	$ 2,000
Undelivered elements (product training, installation, product and support services)	$ 813		$ 813		$ 670
Revenue from services transferred to customers over time, percentage	12.00%	34.00%	12.00%	29.00%
Revenue from products and services transferred to customers, percentage	88.00%	66.00%	88.00%	71.00%