Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Additional Information (Detail)

v3.19.2
Revenue Recognition - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Revenue Recognition [Abstract]          
Revenue from products and services transferred to customers, percentage 81.00% 87.00% 82.00% 85.00%  
Revenue from services transferred to customers over time, percentage 19.00% 13.00% 18.00% 15.00%  
Undelivered elements (product training, installation, product and support services) $ 563   $ 563   $ 730
Revenue recognized from contract liability     300 $ 600  
Extended warranties recognized     $ 400 $ 700