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CONSOLIDATED BALANCE SHEETS [Parenthetical] - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Allowance for doubtful accounts receivable (in dollars) $ 5,578 $ 3,975
Convertible Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Convertible Preferred stock, shares authorized 1,000,000 1,000,000
Convertible Preferred stock, shares outstanding 0 0
Common Class A [Member]    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 30,000,000 30,000,000
Common stock, shares issued 2,146,698 2,249,809
Common stock, shares outstanding 2,146,698 2,249,809
Common Class B [Member]    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 2,861,843 2,861,843
Common stock, shares outstanding 2,861,843 2,861,843
Common Class C [Member]    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 2,928,906 2,928,906
Common stock, shares outstanding 2,928,906 2,928,906
Common Class D [Member]    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 41,928,850 42,102,352
Common stock, shares outstanding 41,928,850 42,102,352