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SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENT INFORMATION - Deferred Costs and Deferred Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jan. 01, 2021
Dec. 31, 2020
Jan. 01, 2020
Deferred costs         $ 1,847   $ 2,525
Total deferred costs amortized $ 453 $ 1,128 $ 4,360 $ 12,023      
Deferred revenue 96 374 96 374 $ 1,779 $ 1,779 $ 3,481
Revenue recognized that was included in deferred revenue balances at beginning of period 0 129 1,779 3,476      
Prepaid expenses and other current assets              
Deferred costs $ 210 $ 417 $ 210 $ 417