XML 96 R81.htm IDEA: XBRL DOCUMENT v3.21.1
Accounts Receivable, net - Loss Allowance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable, net      
Balance at Beginning of year $ 190 $ 290 $ 0
Charges to earnings 0 67 290
Amounts utilized / write-offs 0 (167) 0
Balance at end of year $ 190 $ 190 $ 290