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Stockholders' Equity (Details 4) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2003 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2007 | Mar. 31, 2003 | Mar. 31, 2002 | Mar. 31, 2000
Warrants outstanding |  |  |  |  |  |  |
Warrants outstanding |  | 1,973,427 |  |  |  |  |
Weighted Average Exercise Price (in dollars per share) |  | $ 22.96 |  |  |  |  |
Exercise of Stock Options |  |  |  |  |  |  |
Stock option exercised (in shares) |  | 33,351 | 948 |  |  |  |
Proceeds from exercise of stock options | $ 115,000 | $ 100,000 | $ 3,000 | $ 163,000 | $ 12,000 | $ 106,000 | $ 40,000
April 2006 stock issuance |  |  |  |  |  |  |
Warrants outstanding |  |  |  |  |  |  |
Warrants outstanding |  | 367,347 |  |  |  |  |
Weighted Average Exercise Price (in dollars per share) |  | $ 49.00 |  |  |  |  |
February 2007 stock issuance |  |  |  |  |  |  |
Warrants outstanding |  |  |  |  |  |  |
Warrants outstanding |  | 151,773 |  |  |  |  |
Weighted Average Exercise Price (in dollars per share) |  | $ 59.08 |  |  |  |  |
December 2007 CEFF |  |  |  |  |  |  |
Warrants outstanding |  |  |  |  |  |  |
Warrants outstanding |  | 14,285 |  |  |  |  |
Weighted Average Exercise Price (in dollars per share) |  | $ 9.80 |  |  |  |  |
July 2009 Series II stock issuance |  |  |  |  |  |  |
Warrants outstanding |  |  |  |  |  |  |
Warrants outstanding |  | 98,893 |  |  |  |  |
Weighted Average Exercise Price (in dollars per share) |  | $ 7.00 |  |  |  |  |
January 2010 stock issuance, one |  |  |  |  |  |  |
Warrants outstanding |  |  |  |  |  |  |
Warrants outstanding |  | 101,785 |  |  |  |  |
Weighted Average Exercise Price (in dollars per share) |  | $ 22.82 |  |  |  |  |
January 2010 stock issuance, two |  |  |  |  |  |  |
Warrants outstanding |  |  |  |  |  |  |
Warrants outstanding |  | 100,714 |  |  |  |  |
Weighted Average Exercise Price (in dollars per share) |  | $ 19.95 |  |  |  |  |
October 2010 stock issuance |  |  |  |  |  |  |
Warrants outstanding |  |  |  |  |  |  |
Warrants outstanding |  | 594,513 |  |  |  |  |
Weighted Average Exercise Price (in dollars per share) |  | $ 13.44 |  |  |  |  |
July 2011 stock issuance |  |  |  |  |  |  |
Warrants outstanding |  |  |  |  |  |  |
Warrants outstanding |  | 544,117 |  |  |  |  |
Weighted Average Exercise Price (in dollars per share) |  | $ 9.52 |  |  |  |  |

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