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Supplemental Consolidated Financial Statement Information - Deferred Costs and Deferred Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2020
Jan. 01, 2019
Deferred costs     $ 2,525 $ 6,994
Total deferred costs amortized $ 16,130 $ 38,468    
Deferred revenue 1,779 3,481 $ 3,481 $ 10,501
Revenue recognized that was included in deferred revenue balances at beginning of period 3,476 10,501    
Prepaid expenses and other current assets        
Deferred costs $ 1,847 $ 2,525