XML 61 R50.htm IDEA: XBRL DOCUMENT v3.21.2
Revenue Recognition - Narrative (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2021
USD ($)
course
term
Graduation Fund [Line Items]  
Number of free courses | course 1
Number of successfully completed courses | course 3
Consecutive terms of non attendance in which Graduation Fund credits will be lost | term 1
Expected collection period of current tuition receivable 12 months
Graduation fund estimated to be redeemed | $ $ 19.7
Unbilled receivables | $ $ 0.8
Minimum  
Graduation Fund [Line Items]  
Expected collection period of noncurrent tuition receivable 2 years
Deferred acquisition costs, amortization period 1 year
Maximum  
Graduation Fund [Line Items]  
Expected collection period of noncurrent tuition receivable 4 years
Deferred acquisition costs, amortization period 2 years