|
Summary of Significant Accounting Policies (Details 4)
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9 Months Ended |
|---|---|
|
Sep. 30, 2014
item
|
|
| Capitalized Content Development Costs | |
| Useful life of capitalized content development costs | 5 years |
| Rebate Reserve | |
| Period of teaching in designated low-income school to get rebate | 5 years |
| Period start with in teaching in designated low-income school to get rebate | 6 years |
| Segment and Geographic Information | |
| Number of reportable segments | 1 |
|
Computer hardware | Minimum
|
|
| Property and equipment | |
| Useful life | 3 years |
|
Computer hardware | Maximum
|
|
| Property and equipment | |
| Useful life | 5 years |
|
Furniture and office equipment | Minimum
|
|
| Property and equipment | |
| Useful life | 5 years |
|
Furniture and office equipment | Maximum
|
|
| Property and equipment | |
| Useful life | 7 years |
|
Leasehold improvements | Minimum
|
|
| Property and equipment | |
| Useful life | 4 years |
|
Leasehold improvements | Maximum
|
|
| Property and equipment | |
| Useful life | 10 years |
|
Internally-developed software
|
|
| Property and equipment | |
| Useful life | 3 years |