Shareholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended	6 Months Ended
	May 31, 2012	Jun. 30, 2012	Jun. 30, 2012
Shareholders' Equity [Abstract]
Options exercised during period		168,855	302,916
Net proceeds from options exercised during the period		$ 0.5	$ 1.0
Shares sold under the ESPP	109,282
Weighted average purchase price per shares sold under the ESPP	$ 4.18
Net proceeds from ESPP	$ 0.5