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Significant Accounting Policies - Goodwill and Indefinite-Lived Intangible Assets (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill and Indefinite-Lived Intangible Assets |  |  |
Balance as of the beginning of the period |  | $ 20,744,000 | $ 6,800,000
Acquisition (see Note 3) |  |  | 14,242,000
Measurement period adjustments |  |  | (298,000)
Balance as of the end of period | $ 20,744,000 | 20,744,000 | 20,744,000
New York Code And Design Academy, Inc. |  |  |
Goodwill and Indefinite-Lived Intangible Assets |  |  |
Balance as of the beginning of the period |  | $ 13,944,000 |
Balance as of the end of period |  |  | $ 13,944,000
Goodwill and intangible assets impairment | 0 |  |
Jack Welch Management Institute |  |  |
Goodwill and Indefinite-Lived Intangible Assets |  |  |
Goodwill and intangible assets impairment | $ 0 |  |
Minimum |  |  |
Long-Term Liabilities |  |  |
Lease term |  | 5 years |
Maximum |  |  |
Long-Term Liabilities |  |  |
Lease term |  | 10 years |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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