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Business Combinations - Acquisition of New York Code and Design Academy (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 13, 2016 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |
Deferred payment arrangements value |  | $ 2,200,000 | $ 3,100,000 |
New York Code And Design Academy, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Deferred payment arrangements value |  |  |  | $ 0
New York Code And Design Academy, Inc. | Earnout Period |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingent consideration | $ 12,500,000 |  |  |
Term of additional contingent payments | 5 years |  |  |
Reduction in amount of contingent consideration |  | 0 | $ 0 | $ 7,800,000
Maximum | New York Code And Design Academy, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingent consideration |  | $ 11,500,000 |  |

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