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Significant Accounting Policies - Revenue Recognition (Details)	12 Months Ended
	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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