Acquisition of New York Code and Design Academy (Details) - New York Code And Design Academy, Inc.		1 Months Ended		12 Months Ended
	Jan. 13, 2016 USD ($) individual	Aug. 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Cash paid up front	$ 2,400,000
Total potential cash payments for acquisition				$ 25,000,000
Contingent consideration payment	$ 4,600,000	$ 500,000	$ 6,000,000	$ 0
Number of founders | individual	2
Employment term	3 years
Less: contingent consideration					$ (14,500,000)
Contingent Consideration Results of Operations Over Five Year Period [Member]
Business Acquisition [Line Items]
Contingent consideration	$ 12,500,000
Term of additional contingent payments	5 years
Contingent Consideration Receipt Of State Regulatory Permit [Member]
Business Acquisition [Line Items]
Contingent consideration	$ 5,500,000
Contingent Consideration Accelerated Earnout Upon Receipt Of One State Regulatory Permit [Member]
Business Acquisition [Line Items]
Contingent consideration	1,000,000
Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Transaction Costs	$ 200,000