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Significant Accounting Policies - Revenue Recognition (Details) | 12 Months Ended
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Dec. 31, 2020
Thinkful, Inc |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |
Contractual period | 6 months
Minimum | eTextbooks |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |
Contractual period | 2 months
Minimum | Textbook Library |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |
Contractual period | 2 months
Maximum | eTextbooks |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |
Contractual period | 5 months
Maximum | Textbook Library |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |
Contractual period | 5 months

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