Quarterly report pursuant to Section 13 or 15(d)

Inventories - Schedule of Inventory on Hand by Segment (Detail)

v3.21.1
Inventories - Schedule of Inventory on Hand by Segment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Inventory [Line Items]    
Reserve for obsolescence $ (1,439) $ (1,499)
Inventory, net 588 495
Book Inventories [Member]    
Inventory [Line Items]    
Inventories, gross 2,027 1,994
Reserve for obsolescence (1,439) (1,499)
Inventory, net $ 588 $ 495