Acquisition of New York Code and Design Academy - Purchase Price Allocation (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 13, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 20,744		$ 20,744
Cash paid for acquisition, net of cash acquired			$ 1,635
New York Code And Design Academy, Inc.
Business Acquisition [Line Items]
Cash	$ 790
Other assets	1,265
Trade name	5,660
Goodwill	13,944
Liabilities assumed	(4,734)
Total assets acquired and liabilities assumed, net	16,925
Less: contingent consideration	(14,500)
Cash paid for acquisition, net of cash acquired	$ 1,635
Discount rate		4.50%