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Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Property and equipment |  |  |  |  |  |  |  |  |  |  |
Equipment expense |  |  |  |  |  |  |  |  | $ 3,400 | $ 3,500 | $ 2,600
Capitalized software development costs |  |  |  |  |  |  |  |  | 24,533 | 26,918 | 36,265
Net income (loss) | $ 9,347 | $ 13,043 | $ 13,189 | $ (8,159) | $ (6,603) | $ 8,882 | $ 10,899 | $ (13,637) | $ 27,420 | (459) | 8,551
Capitalized Curriculum Development Costs |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of the software |  |  |  |  |  |  |  |  | 5 years |  |
Capitalized curriculum development costs |  |  |  |  |  |  |  |  | $ 9,927 | 19,132 | 21,627
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 |  |
Student computers |  |  |  |  |  |  |  |  |  |  |
Property and equipment |  |  |  |  |  |  |  |  |  |  |
Accelerated depreciation |  |  |  |  |  |  |  |  | $ 2,100 | 3,500 | 2,800
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 |  |
Assets written-off |  |  |  |  |  |  |  |  |  |  | 500
Capitalized software development additions |  |  |  |  |  |  |  |  | $ 24,500 | $ 26,900 | $ 36,300
Out of period adjustment |  |  |  |  |  |  |  |  |  |  |
Property and equipment |  |  |  |  |  |  |  |  |  |  |
Capitalized software development costs |  |  |  | 2,300 |  |  |  |  |  |  |
Net income (loss) |  |  |  | 1,400 |  |  |  |  |  |  |
Capitalized Curriculum Development Costs |  |  |  |  |  |  |  |  |  |  |
Capitalized curriculum development costs |  |  |  | $ 600 |  |  |  |  |  |  |

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