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Acquisition of New York Code and Design Academy - Purchase Price Allocation (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 13, 2016 | Aug. 31, 2016 | Apr. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 20,744,000 | $ 20,744,000 | $ 20,744,000 |  | $ 6,800,000
Cash paid for acquisition, net of cash acquired |  |  |  |  |  | 7,635,000 |  |
New York Code And Design Academy, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash |  |  |  | 790,000 |  | 790,000 |  |
Other assets |  |  |  | 1,265,000 |  | 1,265,000 |  |
Trade name |  |  |  | 5,660,000 |  | 5,660,000 |  |
Goodwill |  |  |  | 13,944,000 |  | 13,944,000 |  |
Liabilities assumed |  |  |  | (4,734,000) |  | (4,734,000) |  |
Total assets acquired and liabilities assumed, net |  |  |  | 16,925,000 |  | 16,925,000 |  |
Less: contingent consideration |  |  |  | (14,500,000) |  | (14,500,000) |  |
Cash paid for acquisition, net of cash acquired |  |  |  |  |  | $ 1,635,000 |  |
Reduction in fair value of contingent consideration |  |  |  | $ 1,300,000 | 7,800,000 |  |  |
Contingent consideration payment | $ 4,600,000 | $ 500,000 | $ 6,000,000 |  | 0 |  |  |
Deferred payment arrangements value |  |  |  |  | 0 |  |  |
New York Code And Design Academy, Inc. | Maximum |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  | $ 11,500,000 |  | $ 11,500,000 |

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