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Acquisitions - 2019 Acquisition Summary of Fair Value of the Consideration (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 02, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 01, 2019 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 214,513 | $ 149,524 |  | $ 125,272
Thinkful, Inc |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash |  |  |  | $ 51 |
Accounts receivable |  |  |  | 547 |
Other acquired assets |  |  |  | 1,710 |
Acquired intangible assets |  |  |  | 16,360 |
Total identifiable assets acquired |  |  |  | 18,668 |
Deferred revenue |  |  |  | (3,044) |
Liabilities assumed |  |  |  | (1,605) |
Net identifiable assets acquired |  |  |  | 14,019 |
Goodwill |  |  |  | 65,181 |
Total fair value of purchase consideration |  |  |  | $ 79,200 |
WriteLab, Inc. And StudyBlue, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash |  | 234 |  |  |
Accounts receivable |  | 482 |  |  |
Acquired intangible assets |  | 11,550 | $ 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 |  |
StudyBlue, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash | $ 152 |  |  |  |
Accounts receivable | 288 |  |  |  |
Acquired intangible assets | 7,100 |  |  |  |
Total identifiable assets acquired | 7,691 |  |  |  |
Liabilities assumed | (1,309) |  |  |  |
Net identifiable assets acquired | 6,382 |  |  |  |
Goodwill | 13,996 |  |  |  |
Total fair value of purchase consideration | $ 20,378 |  |  |  |
Weighted average amortization period | 57 months |  |  |  |
Trade name | Thinkful, Inc |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired intangible assets |  | $ 4,430 |  |  |
Weighted average amortization period |  | 48 months |  |  |
Trade name | WriteLab, Inc. And StudyBlue, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired intangible assets |  |  | $ 140 |  |
Weighted average amortization period |  |  | 12 months |  |
Trade name | StudyBlue, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired intangible assets | $ 140 |  |  |  |
Weighted average amortization period | 12 months |  |  |  |
Domain names | Thinkful, Inc |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired intangible assets |  | $ 330 |  |  |
Weighted average amortization period |  | 48 months |  |  |
Domain names | WriteLab, Inc. And StudyBlue, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired intangible assets |  |  | $ 180 |  |
Weighted average amortization period |  |  | 12 months |  |
Domain names | StudyBlue, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired intangible assets | $ 180 |  |  |  |
Weighted average amortization period | 12 months |  |  |  |
Content library | Thinkful, Inc |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired intangible assets |  | $ 6,940 |  |  |
Weighted average amortization period |  | 60 months |  |  |
Content library | WriteLab, Inc. And StudyBlue, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired intangible assets |  |  | $ 5,220 |  |
Weighted average amortization period |  |  | 60 months |  |
Content library | StudyBlue, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired intangible assets | $ 5,220 |  |  |  |
Weighted average amortization period | 60 months |  |  |  |
Developed technology | Thinkful, Inc |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired intangible assets |  | $ 4,660 |  |  |
Weighted average amortization period |  | 36 months |  |  |
Developed technology | WriteLab, Inc. And StudyBlue, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired intangible assets |  |  | $ 5,790 |  |
Weighted average amortization period |  |  | 88 months |  |
Developed technology | StudyBlue, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired intangible assets | $ 1,340 |  |  |  |
Weighted average amortization period | 60 months |  |  |  |
Acquired intangible assets | Thinkful, Inc |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired intangible assets |  | $ 16,360 |  |  |
Weighted average amortization period |  | 50 months |  |  |

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