Subsequent Events (Details) (USD $)	0 Months Ended	1 Months Ended	0 Months Ended	12 Months Ended
	Aug. 09, 2012	Mar. 26, 2013	Mar. 14, 2011	Dec. 31, 2012	Dec. 31, 2011
Subsequent Event [Line Items]
Number of options granted (in shares)		62,401
Exercise price		$ 7.26
Weighted average grant date fair value (in dollars per share)		$ 2.33		$ 6.27	$ 7.33
Percentage of shares vested on first anniversary of the grant date (in hundredths)	30.00%	30.00%	30.00%
Percentage of shares vested on second anniversary of the grant date (in hundredths)	30.00%	30.00%	30.00%
Percentage of shares vested on third anniversary of the grant date (in hundredths)	40.00%	40.00%	40.00%
Restricted Stock [Member]
Subsequent Event [Line Items]
Number of options granted (in shares)				20,782	10,928
Number of restricted shares granted		8,135
Weighted average grant date fair value (in dollars per share)		$ 5.81
Percentage of shares vested on first anniversary of the grant date (in hundredths)		30.00%
Percentage of shares vested on second anniversary of the grant date (in hundredths)		30.00%
Percentage of shares vested on third anniversary of the grant date (in hundredths)		40.00%