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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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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e7008-128479 + Details
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