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Acquisitions - 2018 Acquisitions summary of Fair Value of the Consideration (Details) - USD ($) $ in Thousands |  | 2 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 02, 2018 | Jul. 02, 2018 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | May 15, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 149,524 | $ 285,214 | $ 214,513 |
StudyBlue, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash | $ 152 | $ 152 |  |  |  |
Accounts receivable | 288 | 288 |  |  |  |
Other acquired assets | 151 | 151 |  |  |  |
Acquired intangible assets | 7,100 | 7,100 |  |  |  |
Total identifiable assets acquired | 7,691 | 7,691 |  |  |  |
Liabilities assumed | (1,309) | (1,309) |  |  |  |
Net identifiable assets acquired | 6,382 | 6,382 |  |  |  |
Goodwill | 13,996 | 13,996 |  |  |  |
Total fair value of purchase consideration | $ 20,378 | $ 20,378 |  |  |  |
Weighted average amortization period | 57 months |  |  |  |  |
WriteLab, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  |  |  |  |  | $ 82
Accounts receivable |  |  |  |  |  | 194
Other acquired assets |  |  |  |  |  | 0
Acquired intangible assets |  |  |  |  |  | 4,450
Total identifiable assets acquired |  |  |  |  |  | 4,726
Liabilities assumed |  |  |  |  |  | (897)
Net identifiable assets acquired |  |  |  |  |  | 3,829
Goodwill |  |  |  |  |  | 10,677
Total fair value of purchase consideration |  |  |  |  |  | 14,506
Acquisition related expenses |  |  | 1,000 |  |  |
Weighted average amortization period |  | 96 months |  |  |  |
WriteLab, Inc. And StudyBlue, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  |  | 234 |  |  |
Accounts receivable |  |  | 482 |  |  |
Other acquired assets |  |  | 151 |  |  |
Acquired intangible assets |  |  | 11,550 |  |  |
Total identifiable assets acquired |  |  | 12,417 |  |  |
Liabilities assumed |  |  | (2,206) |  |  |
Net identifiable assets acquired |  |  | 10,211 |  |  |
Goodwill |  |  | 24,673 |  |  |
Total fair value of purchase consideration |  |  | $ 34,884 |  |  |
Weighted average amortization period |  |  | 72 months |  |  |
Trade name | StudyBlue, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets | $ 140 | $ 140 |  |  |  |
Weighted average amortization period | 12 months |  |  |  |  |
Trade name | WriteLab, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  | 0
Weighted average amortization period |  | 0 years |  |  |  |
Trade name | WriteLab, Inc. And StudyBlue, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets |  |  | $ 140 |  |  |
Weighted average amortization period |  |  | 12 months |  |  |
Domain names | StudyBlue, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets | $ 180 | $ 180 |  |  |  |
Weighted average amortization period | 12 months |  |  |  |  |
Domain names | WriteLab, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  | 0
Weighted average amortization period |  | 0 years |  |  |  |
Domain names | WriteLab, Inc. And StudyBlue, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets |  |  | $ 180 |  |  |
Weighted average amortization period |  |  | 12 months |  |  |
Non-compete agreements | StudyBlue, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets | $ 220 | $ 220 |  |  |  |
Weighted average amortization period | 36 months |  |  |  |  |
Non-compete agreements | WriteLab, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  | 0
Weighted average amortization period |  | 0 years |  |  |  |
Non-compete agreements | WriteLab, Inc. And StudyBlue, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets |  |  | $ 220 |  |  |
Weighted average amortization period |  |  | 36 months |  |  |
Developed technology | StudyBlue, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets | $ 1,340 | $ 1,340 |  |  |  |
Weighted average amortization period | 60 months |  |  |  |  |
Developed technology | WriteLab, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  | 4,450
Weighted average amortization period |  | 96 months |  |  |  |
Developed technology | WriteLab, Inc. And StudyBlue, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets |  |  | $ 5,790 |  |  |
Weighted average amortization period |  |  | 88 months |  |  |
Content library | StudyBlue, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets | $ 5,220 | $ 5,220 |  |  |  |
Weighted average amortization period | 60 months |  |  |  |  |
Content library | WriteLab, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets |  |  |  |  |  | $ 0
Weighted average amortization period |  | 0 years |  |  |  |
Content library | WriteLab, Inc. And StudyBlue, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets |  |  | $ 5,220 |  |  |
Weighted average amortization period |  |  | 60 months |  |  |

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