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Stockholders' Equity - Summary of Anti-Dilutive Options Excluded (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stockholders' Equity Note [Abstract]    
Options to purchase shares of common stock 1,292,528 1,168,083
Weighted average exercise prices of options $ 54.00 $ 54.00