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Acquisition of New York Code and Design Academy (Details) - New York Code And Design Academy, Inc. $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 13, 2016 USD ($) | Aug. 31, 2016 USD ($) | Apr. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) individual
Business Acquisition [Line Items] |  |  |  |
Cash paid up front | $ 2.4 |  |  |
Contingent consideration |  |  |  | $ 25.0
Contingent consideration payment |  | $ 0.5 | $ 6.0 | $ 4.6
Number of founders | individual |  |  |  | 2
Employment term |  |  |  | 3 years
Contingent Consideration Results of Operations Over Five Year Period [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingent consideration | $ 12.5 |  |  |
Term of additional contingent payments | 5 years |  |  |
Contingent Consideration Receipt Of State Regulatory Permit [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingent consideration | $ 5.5 |  |  |
Contingent Consideration Accelerated Earnout Upon Receipt Of One State Regulatory Permit [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingent consideration | 1.0 |  |  |
Selling, General and Administrative Expenses [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Transaction Costs | $ 0.2 |  |  |

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