EQUITY IPO (Details) (USD $)	12 Months Ended							1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jul. 31, 2012	Aug. 03, 2012 Common Class B [Member]	Aug. 03, 2012 Common Class A [Member]	Jul. 30, 2012 Series E Preferred Stock [Member]	Aug. 31, 2012 Conversion of Class B to Class A [Member]	Aug. 31, 2012 Conversion of Class B to Class A [Member] Less than 10 Percent [Member]	Aug. 31, 2012 Conversion of Class C to Class A [Member]	Aug. 31, 2012 Conversion of Class B to Class A, Selling Stockholders [Member]	Aug. 31, 2012 Conversion of Class E to Class B [Member]	Aug. 31, 2012 Issued by Company [Member] Common Class A [Member]
Preferred stock, shares outstanding (in shares)	0	50,691,000					50,691,245
Reverse stock split, conversion ratio				3.25
Convertible preferred stock maximum price to trigger increase in conversion ratio (in usd per share)					$ 14.10
Shares sold for initial public offering (in shares)													2,083,333
Series E original issue price							$ 7.05
Offering price per share (in usd per share)						$ 12
Gross proceeds from issuance initial public offering	$ 25,000,000
Proceeds from issuance initial public offering, net of fees and expenses	$ 20,960,000	$ 0	$ 0
Conversion of stock, shares converted (in shares)									49,655,411	73,554	3,039,385	15,597,300
Conversion of stock, requirements, maximum ownership percentage								10.00%