CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares upon exercise of common stock options (in shares)	362,250	22,750
Issuance of shares upon exercise of common stock warrants (in shares)	291,856	476,056
Issuance of shares for an acquisition (in shares)	100,000