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Acquisition of New York Code and Design Academy - Purchase Price Allocation (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jan. 13, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Business Acquisition [Line Items]            
Goodwill   $ 20,744,000   $ 20,744,000   $ 20,744,000
Cash paid for acquisition, net of cash acquired         $ 7,635,000  
Reduction in fair value of contingent consideration   2,300,000 $ 0   $ 0  
Deferred payment arrangements value   3,700,000   $ 3,700,000   $ 3,400,000
New York Code And Design Academy, Inc.            
Business Acquisition [Line Items]            
Cash $ 790,000          
Other assets 1,265,000          
Trade name 5,660,000          
Goodwill 13,944,000          
Liabilities assumed (4,734,000)          
Total assets acquired and liabilities assumed, net 16,925,000          
Less: contingent consideration (14,500,000)          
Cash paid for acquisition, net of cash acquired $ 1,635,000          
Discount rate       4.50%    
Deferred payment arrangements value   5,500,000   $ 5,500,000    
New York Code And Design Academy, Inc. | Maximum [Member]            
Business Acquisition [Line Items]            
Deferred payment arrangements value   $ 11,500,000   $ 11,500,000