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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