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Acquisition of New York Code and Design Academy (Details) - New York Code And Design Academy, Inc.
$ in Thousands
 1 Months Ended 6 Months Ended
Jan. 13, 2016
USD ($)
Aug. 31, 2016
USD ($)
Apr. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
individual
Business Acquisition [Line Items]        
Cash paid up front $ 2,400      
Contingent consideration       $ 25,000
Contingent consideration payment   $ 500 $ 6,000 $ 4,600
Number of founders | individual       2
Employment term       3 years
Less: contingent consideration (14,500)      
Contingent Consideration Results of Operations Over Five Year Period [Member]        
Business Acquisition [Line Items]        
Contingent consideration $ 12,500     $ 12,500
Term of additional contingent payments 5 years      
Contingent Consideration Receipt Of State Regulatory Permit [Member]        
Business Acquisition [Line Items]        
Contingent consideration $ 5,500      
Contingent Consideration Accelerated Earnout Upon Receipt Of One State Regulatory Permit [Member]        
Business Acquisition [Line Items]        
Contingent consideration 1,000      
Selling, General and Administrative Expenses [Member]        
Business Acquisition [Line Items]        
Transaction Costs $ 200