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Other Long-Term Liabilities - Deferred (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Funds received from investor	$ 2.8
Deferred payment arrangements value	$ 3.6	$ 3.6
Minimum
Leasehold improvements and long-term liability amortization period	5 years
Maximum
Leasehold improvements and long-term liability amortization period	10 years
New York Code And Design Academy, Inc.
Contingent consideration			$ 11.5

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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