Other Long-Term Liabilities - Deferred (Details) - USD ($)	1 Months Ended		9 Months Ended
	Aug. 31, 2016	Apr. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Funds received from investor			$ 2,800,000
Deferred payment arrangements value			$ 3,200,000	$ 3,400,000
Minimum [Member]
Leasehold improvements and long-term liability amortization period			5 years
Maximum
Leasehold improvements and long-term liability amortization period			10 years
New York Code And Design Academy, Inc.
Deferred payment arrangements value			$ 0
Total potential cash payments for acquisition			25,000,000
Contingent consideration payment	$ 500,000	$ 6,000,000	4,600,000
New York Code And Design Academy, Inc. | Maximum
Contingent consideration			$ 11,500,000