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Subsequent Events - (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 14, 2014
Subsequent Event [Member]
Mar. 14, 2014
Subsequent Event [Member]
Common Stock [Member]
Mar. 14, 2014
Subsequent Event [Member]
Common Stock [Member]
Subsequent Event [Line Items]            
Issuance of common stock upon exercise of warrants, shares         5,072,900  
Warrants exercised 5,402,000 8,883,000       5,095,616
Proceeds from warrant exercises           $ 9,371
Warrants outstanding 14,850,000 13,216,000 14,121,000     9,753,815
Issuance of common stock in connection with employee stock purchase plan, shares 243,510       3,158,338  
Exercise of stock options, shares 289,000     3,182,764    
Net proceeds from exercise of stock options $ 567 $ 21    $ 3,889    
Options outstanding, shares 13,159,000 7,672,000   9,335,403