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Business Combinations - Acquisition of New York Code and Design Academy (Details) |  | 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, 2018 item
Discount Rate |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration, liability, measurement input | item |  |  |  |  | 0.045
New York Code And Design Academy, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash paid in acquisition | $ 2,400,000 |  |  |  |
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) |  |  |  |
New York Code And Design Academy, Inc. | 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 |  |  |  |
New York Code And Design Academy, Inc. | Contingent Consideration Receipt Of State Regulatory Permit [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration | $ 5,500,000 |  |  |  |
New York Code And Design Academy, Inc. | Contingent Consideration Accelerated Earnout Upon Receipt Of One State Regulatory Permit [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration | 1,000,000 |  |  |  |
New York Code And Design Academy, Inc. | Selling, General and Administrative Expenses [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Transaction costs | $ 200,000 |  |  |  |

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