Stockholders' Equity (Details Textual) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended		9 Months Ended	0 Months Ended	1 Months Ended		0 Months Ended	1 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Series B Preferred Stock [Member]	Dec. 31, 2012 Series B Preferred Stock [Member]	Sep. 30, 2013 Common Stock [Member]	Jan. 18, 2013 Liberty Media [Member] Series B Preferred Stock [Member]	Sep. 30, 2012 Liberty Media [Member] Series B Preferred Stock [Member]	Mar. 31, 2009 Liberty Media [Member] Series B Preferred Stock [Member]	Jan. 18, 2013 Liberty Media [Member] Common Stock [Member]	Jan. 31, 2013 Liberty Media [Member] Common Stock [Member]	Sep. 30, 2012 Liberty Media [Member] Common Stock [Member]	Dec. 31, 2012 December 2012 Share Repurchase Program [Member] Common Stock [Member]
Additional Stockholder's Equity (Textual) [Abstract]
Common stock, par value (in dollars per share)	$ 0.001		$ 0.001		$ 0.001
Common stock, shares authorized	9,000,000,000		9,000,000,000		9,000,000,000
Common stock, shares issued	6,134,596,655		6,134,596,655		5,262,440,085
Common stock, shares outstanding	6,134,596,655		6,134,596,655		5,262,440,085
Common stock reserved for issuance	574,620,000		574,620,000
Stock repurchase program, authorized amount															$ 2,000,000,000
Common stock repurchased (in shares)								476,545,601
Common stock repurchased			1,602,360,000					1,602,360,000
Remaining amount authorized under the stock repurchase program			397,640,000
Amortization of costs related to share-lending arrangement and other issuance costs	3,178,000	3,139,000	9,484,000	9,181,000
Unamortized, debt issuance costs	15,962,000		15,962,000		27,652,000
Unamortized, debt issuance costs recorded in deferred financing fees, net	15,612,000		15,612,000		27,099,000
Unamortized, debt issuance costs recorded in long-term related party assets	$ 350,000		$ 350,000		$ 553,000
Preferred stock, par value (in dollars per share)	$ 0.001		$ 0.001		$ 0.001
Undesignated preferred stock, shares authorized	50,000,000		50,000,000		50,000,000
Preferred stock, shares issued						0	6,250,100				12,500,000
Preferred stock, shares outstanding						0	6,250,100
Conversion of preferred stock to common stock (in shares)						6,250,100			6,250,100	6,249,900		1,293,509,076	1,293,509,076	1,293,467,684
Number of outstanding warrants to acquire common stock (in shares)	18,455,000		18,455,000		18,455,000
Average exercise price (in dollars per warrant)	2.55		2.55		2.55