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Share-Based Payments - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Sep. 23, 2009
Compensation Related Costs [Abstract]          
Percentage of issued and outstanding shares of common stock provides for grants of restricted common stock, restricted stock units and other equity-based awards         7.50%
Recognized stock-based compensation expense $ 428 $ 886 $ 1,311 $ 1,969