Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts receivable, allowance for doubtful accounts	$ 137	$ 180
Due from related parties, allowance for doubtful accounts	$ 514	$ 0
Preferred stock, par value (in dollars per share)	$ 0.0001
Preferred stock, shares authorized	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Treasury stock, shares	65,549	0
Class A common stock
Common stock, par value (in dollars per share)	$ 0.0001
Common stock, shares authorized	100,000,000
Common stock, shares issued	11,241,000	0
Common stock, shares outstanding	11,241,000	0
Class B common stock
Common stock, par value (in dollars per share)	$ 0.0001
Common stock, shares authorized	33,000,000
Common stock, shares issued	33,000,000	0
Common stock, shares outstanding	33,000,000	0