XML 77 R61.htm IDEA: XBRL DOCUMENT v3.21.1
Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Accounts receivable $ 276 $ 371
Less: Allowance for doubtful accounts (1) (3)
Accounts receivable - net $ 275 $ 368