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Stockholders Equity (Details) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 9 Months Ended | 3 Months Ended | 12 Months Ended |  | 9 Months Ended | 3 Months Ended | 9 Months Ended |
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Oct. 31, 2013 | May 31, 2012 | Jun. 30, 2009 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Nov. 04, 2014 Subsequent Event [Member] | Sep. 30, 2014 2004 Stock Incentive Plan [Member] | Sep. 30, 2014 2009 Stock Incentive Plan [Member] | Sep. 30, 2014 Stock Options [Member] | Sep. 30, 2013 Stock Options [Member] | Sep. 30, 2014 Stock Options [Member] | Sep. 30, 2013 Stock Options [Member] | Sep. 30, 2014 Restricted Stock [Member] | Sep. 30, 2013 Restricted Stock [Member] | Sep. 30, 2014 Restricted Stock [Member] | Sep. 30, 2013 Restricted Stock [Member] | May 31, 2012 2012 Warrants [Member] | Sep. 30, 2014 2012 Warrants [Member] | Jun. 30, 2009 2009 Warrants [Member] | Jun. 30, 2014 2009 Warrants [Member] | Oct. 31, 2013 2013 Warrants [Member] | Sep. 30, 2014 2013 Warrants [Member] | Mar. 31, 2014 Sales Agreement March 2013 [Member] Cowen and Company, LLC [Member] | Dec. 31, 2013 Sales Agreement March 2013 [Member] Cowen and Company, LLC [Member] | Sep. 30, 2014 Sales Agreement March 2013 [Member] Cowen and Company, LLC [Member] | Sep. 30, 2014 CEFF [Member] Terrapin Opportunity, L.P. [Member] | Mar. 31, 2013 Sales Agreement December 2011 [Member] Cowen and Company, LLC [Member] | Sep. 30, 2013 Sales Agreement December 2011 [Member] Cowen and Company, LLC [Member] | Dec. 31, 2013 Sales Agreement December 2011 [Member] Cowen and Company, LLC [Member]
Stock Issuances [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  |  | one-for- sixteen (1:16) | one-for- sixteen (1:16) | one-for- sixteen (1:16) | one-for- sixteen (1:16) | one-for- sixteen (1:16) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 170,000,000 |  | 170,000,000 |  | 170,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value under sales agreement (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  | $ 0.01
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,400,000 | $ 5,000,000 |  | $ 11,100,000 |  | $ 20,900,000 |
Proceeds of common stock issued, net of related expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,400,000 | 4,800,000 |  | 10,800,000 |  | 20,800,000 |
Number of shares of common stock remaining for sale under the offering program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Common stock sold through the program (in shares) | 1,300,000 | 1,000,000 | 100,000 |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 1,000,000 |  | 500,000 | 14,200,000 |  |
Aggregate proceeds from sale of common stock under equity offering program, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  | 39,800,000
Aggregate proceeds from sale of common stock under equity offering program, remaining |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,400,000 |  |  |  |
Amount to be purchased by party under agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,000,000 |  |  |
Term of purchase agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24 months |  |  |
Amount available under committed equity financing facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,900,000 |  |  |
Warrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  | 100,000 |  | 600,000 |  |  |  |  |  |  |  |
Proceeds from issuance of private placement | 7,500,000 | 21,500,000 | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of private placement | 6,900,000 | 21,100,000 | 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value allocated to warrants issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,400,000 |  | 2,200,000 |  | 1,900,000 |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.56 |  |  |  | $ 7.04 |  |  |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 260,000 |  |  |  | 600,000 |  |  |  |  |  |  |
Term period for warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  | 5 years |  | 5 years |  |  |  |  |  |  |
Warrants Exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,000 |  | 35,000 |  | 0 |  |  |  |  |  |  |
Net proceeds from exercise of warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,000 |  | 100,000 |  |  |  |  |  |  |  |  |
Stock Incentive Plans [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares reserved for the issuance (in shares) |  |  |  |  |  |  |  |  |  | 187,500 | 406,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum term of options |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expense |  |  |  |  |  | 321,000 | 407,000 |  |  |  |  | 100,000 |  | 300,000 | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized compensation income |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock compensation expense |  |  |  |  |  | 96,000 | 179,000 |  |  |  |  |  |  |  |  | 40,000 |  | 100,000 | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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