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Acquisition of New York Code and Design Academy - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]        
Goodwill $ 20,744 $ 20,744 $ 6,800 $ 6,800
Cash paid for acquisition, net of cash acquired   7,635    
New York Code And Design Academy, Inc.        
Business Acquisition [Line Items]        
Cash 790 790    
Other assets 1,265 1,265    
Trade name 5,660 5,660    
Goodwill 13,944 13,944    
Liabilities assumed (4,734) (4,734)    
Total assets acquired and liabilities assumed, net 16,925 16,925    
Less: contingent consideration (14,500) (14,500)    
Cash paid for acquisition, net of cash acquired   $ 1,635    
Discount rate   4.50%    
Measurement adjustment to goodwill   $ 300    
Reduction in fair value of contingent consideration $ 1,300      
Measurement adjustment to deferred tax liabilities   $ 300