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Stock Based Awards (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of options activity      
Options, beginning balance 20,852,614 21,443,617 21,372,959
Options, granted   825,000 860,000
Options, forfeitures or expirations (73,907) (135,316) (336,868)
Options, exercised (8,018,516) (1,280,687) (452,474)
Options, ending balance 12,760,191 20,852,614 21,443,617
Weighted average exercise price of options, beginning balance $ 0.79 $ 0.60 $ 0.57
Weighted average exercise price, granted $ 0.00 $ 5.80 $ 2.38
Weighted average exercise price of options, forfeitures or expirations $ 1.75 $ 2.04 $ 2.77
Weighted average exercise price of options, exercised $ 0.58 $ 0.64 $ 1.15
Weighted average exercise price of options, ending balance $ 0.95 $ 0.79 $ 0.60