Quarterly report pursuant to Section 13 or 15(d)

Inventory - Additional Information (Detail)

v3.19.2
Inventory - Additional Information (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Inventory includes write-downs for excess and obsolete inventory $ 1.1 $ 1.1