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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 |  |

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