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Assets and Liabilities Measured at Fair Value (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 1 Months Ended | 6 Months Ended |  | 1 Months Ended | 6 Months Ended |
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May 31, 2012 | Jun. 30, 2009 | Jun. 30, 2013 | Jun. 30, 2013 Input | Jun. 30, 2013 Recurring [Member] Warrant liability [Member] | Jun. 30, 2013 Recurring [Member] Warrant liability [Member] Level 1 [Member] | Jun. 30, 2013 Recurring [Member] Warrant liability [Member] Level 2 [Member] | Jun. 30, 2013 Recurring [Member] Warrant liability [Member] Level 3 [Member] | Jun. 30, 2013 Recurring [Member] Money market funds [Member] | Jun. 30, 2013 Recurring [Member] Money market funds [Member] Level 1 [Member] | Jun. 30, 2013 Recurring [Member] Money market funds [Member] Level 2 [Member] | Jun. 30, 2013 Recurring [Member] Money market funds [Member] Level 3 [Member] | Jun. 30, 2009 2009 Warrants [Member] | Jun. 30, 2013 2009 Warrants [Member] | Mar. 13, 2013 2009 Warrants [Member] | May 31, 2012 2012 Warrants [Member] | Jun. 30, 2013 2012 Warrants [Member] | Mar. 13, 2013 2012 Warrants [Member]
Derivative warrant liability [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of inputs used for valuation of warrants |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock (in shares) | 15.3 | 0.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of warrants to purchase common shares (in shares) | 4.6 | 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock | $ 21,500,000 | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | 21,100,000 | 2,700,000 |  |  |  |  |  |  |  |  |  |  | 2,200,000 |  |  | 3,400,000 |  |
Exercise price of warrants (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.20 |  |  | $ 1.20 |
Warrants outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.0 |  |  | 4.4
Term of warrant |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  | 3 years |  |
Pre-tax derivative instrument income |  |  | 5,100,000 | 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected volatility (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.60% |  |  | 91.75% |
Risk-free interest rates (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.15% |  |  | 0.36% |
Expected life |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  | 2 years |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  |  |  |  |  |  |  |  | 1,956,000 | 1,956,000 | 0 | 0 |  |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Liabilities |  |  |  |  | 366,000 | 0 | 0 | 366,000 |  |  |  |  |  |  |  |  |  |
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance as of December 31, 2012 |  |  |  | 3,427,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total change in the fair value of the liability included in earnings |  |  |  | (2,842,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants exercised |  |  |  | (219,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance as of March 31, 2013 |  |  | $ 366,000 | $ 366,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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