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- Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2018
Disaggregation of Revenue [Line Items]      
Accounts and notes receivable $ 138,738,000 $ 123,132,000  
Deferred revenue and student deposits, current 47,180,000 54,849,000  
Capitalized contract cost 4,000,000 3,000,000  
Capitalized contract cost, accumulated amortization 1,900,000 900,000  
Amortization of capitalized costs 1,100,000 700,000  
(Accumulated deficit) retained earnings $ (176,822,000) $ 436,509,000  
Minimum      
Disaggregation of Revenue [Line Items]      
Contract cost, amortization period 2 years    
Maximum      
Disaggregation of Revenue [Line Items]      
Contract cost, amortization period 4 years    
Commission and Bonuses      
Disaggregation of Revenue [Line Items]      
Remaining performance obligations recognition period one year or less    
Incremental Costs Of Obtaining A Contract With Customer      
Disaggregation of Revenue [Line Items]      
Remaining performance obligations recognition period one year or less    
Incremental Cost Of Obtaining A Contract With Students      
Disaggregation of Revenue [Line Items]      
Remaining performance obligations recognition period one year or less    
Accounting Standards Update 2014-09 | Cumulative Effect, Period of Adoption, Adjustment      
Disaggregation of Revenue [Line Items]      
(Accumulated deficit) retained earnings     $ 1,400,000