CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2009
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares upon exercise of common stock options (in shares)	22,750	5,250
Issuance of shares upon exercise of common stock warrants (in shares)	476,056	0