XML 95 R79.htm IDEA: XBRL DOCUMENT v3.20.4
Other Income (Expense), Net - Components of Other Income (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Income and Expenses [Abstract]      
Rental income, net $ 792,000 $ 792,000 $ 792,000
Foreign currency gains (losses), net 181,000 (108,000) (260,000)
Interest income 95,000 300,000 257,000
Gain on disposal of equipment 13,000 38,000 57,000
Credit gains on available-for-sale securities 4,000 4,000 7,000
Other 8,000 40,000 21,000
Total other income (expense), net $ 1,093,000 $ 1,066,000 $ 874,000