Consolidated Statements of Stockholders' Equity (Parenthetical)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Stockholders' Equity [Abstract]
Issuance of common stock for warrant exercises (in shares)			292,745
Issuance of common stock upon issuance of restricted stock awards (in shares)		39,042	325,314
Issuance of common stock upon exercise of stock options (in shares)	5,200		53,365
Issuance of common stock upon conversion of notes (in shares)			99,985
Issuance of common stock upon merger (in shares)		2,593,882
Issuance of preferred stock upon merger (in shares)		9,174,589
Conversion of preferred stock into common stock (in shares)	9,174,589