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Commitments and Contingencies (Details) - APUS - USD ($)
$ in Thousands
Aug. 06, 2018
Mar. 28, 2018
Loss Contingencies [Line Items]    
Payments to enter Assurance of Discontinuance $ 270  
Irrevocable letter of credit as percentage of total program funds   25.00%
Irrevocable letter of credit posted   $ 700