Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2010
Proceeds from secondary public offering net of issuance costs	$ 4,130
Common stock [Member]
Proceeds from secondary public offering net of issuance costs	4,130
Additional paid-in capital
Proceeds from secondary public offering net of issuance costs	$ 4,130