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Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Property and equipment          
Depreciation expense $ 4,500   $ 4,200 $ 8,900 $ 8,600
Peripheral equipment write down 400   800 2,500 2,700
Capitalized software development costs       13,378 13,446
Net loss 13,189   10,899 $ 5,030 (2,738)
Capitalized Curriculum Development Costs          
Estimated useful life of the software       5 years  
Capitalized curriculum development additions       $ 4,474 9,141
Amortization expense 4,900   5,000 10,100 9,600
Out of period adjustment          
Property and equipment          
Capitalized software development costs   $ 2,300      
Net loss   1,400      
Capitalized Curriculum Development Costs          
Capitalized curriculum development additions   $ 600      
Student and state testing computers          
Property and equipment          
Accelerated Depreciation 500   500 $ 900 1,000
Student and state testing computers | Minimum          
Property and equipment          
Useful Life       3 years  
Student and state testing computers | Maximum          
Property and equipment          
Useful Life       5 years  
Computer hardware          
Property and equipment          
Useful Life       3 years  
Computer software | Minimum          
Property and equipment          
Useful Life       3 years  
Computer software | Maximum          
Property and equipment          
Useful Life       5 years  
Web site development costs          
Property and equipment          
Useful Life       3 years  
Office equipment          
Property and equipment          
Useful Life       5 years  
Furniture and fixtures          
Property and equipment          
Useful Life       7 years  
Leasehold improvements | Minimum          
Property and equipment          
Useful Life       3 years  
Leasehold improvements | Maximum          
Property and equipment          
Useful Life       12 years  
Capitalized software          
Property and equipment          
Useful Life       3 years  
Amortization expense $ 8,400   $ 8,800 $ 18,700 $ 16,800