Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenue Recognition [Abstract]
Revenue from products and services transferred to customers, percentage	74.00%	84.00%
Revenue from services transferred to customers over time, percentage	26.00%	16.00%
Undelivered elements (product training, installation, product and support services)	$ 476		$ 559
Revenue recognized from contract liability	100
Extended warranties recognized	$ 1,000