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CERTAIN BALANCE SHEET ACCOUNTS (Tables)
 12 Months Ended
Dec. 31, 2020
Payables and Accruals [Abstract]  
Prepaid Expenses And Other Current Assets Prepaid expenses and other current assets as of December 31, 2020 and 2019 consist of the following:
20202019
Non-trade receivables related to custodial funds418 $4,118 
Receivable from sale of Workspace Management— 1,685 
Prepaid expenses1,394 1,454 
Other current assets1,472 1,294 
Total3,284 $8,551 
Other Accrued Liabilities
Other accrued liabilities as of December 31, 2020 and 2019 consist of the following:
20202019
Income taxes payable$— $2,608 
Accrued expenses and other1,380 3,948 
Total$1,380 $6,556