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Fair Value Measurements (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2014 Input
Derivative warrant liability [Abstract] |  |
Number of inputs used for valuation of warrants |  | 6
Pre-tax derivative instrument expense | $ 1,300,000 | $ 1,100,000
Hypothetical change in market price of common shares (in hundredths) |  | 10.00%
Impact of the hypothetical change in market price of common shares on derivative liability |  | 200,000
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward] |  |
Beginning balance as of December 31, 2013 |  | 2,310,000
Total change in the fair value of the liability included in earnings, including warrant expairations |  | (1,092,000)
Fair value of warrants exercised |  | (143,000)
Ending balance as of June 30, 2014 | 1,075,000 | 1,075,000
Recurring [Member] | Warrant liability [Member] |  |
Liabilities [Abstract] |  |
Total Liabilities | 1,075,000 | 1,075,000
Recurring [Member] | Warrant liability [Member] | Level 1 [Member] |  |
Liabilities [Abstract] |  |
Total Liabilities | 0 | 0
Recurring [Member] | Warrant liability [Member] | Level 2 [Member] |  |
Liabilities [Abstract] |  |
Total Liabilities | 0 | 0
Recurring [Member] | Warrant liability [Member] | Level 3 [Member] |  |
Liabilities [Abstract] |  |
Total Liabilities | 1,075,000 | 1,075,000
Recurring [Member] | Money market funds [Member] |  |
Assets [Abstract] |  |
Total Assets | 1,945,000 | 1,945,000
Recurring [Member] | Money market funds [Member] | Level 1 [Member] |  |
Assets [Abstract] |  |
Total Assets | 1,945,000 | 1,945,000
Recurring [Member] | Money market funds [Member] | Level 2 [Member] |  |
Assets [Abstract] |  |
Total Assets | 0 | 0
Recurring [Member] | Money market funds [Member] | Level 3 [Member] |  |
Assets [Abstract] |  |
Total Assets | $ 0 | $ 0
2012 Warrants [Member] |  |
Derivative warrant liability [Abstract] |  |
Expected volatility (in hundredths) |  | 111.35%
Risk-free interest rates (in hundredths) |  | 0.11%
Expected life (in years) |  | 0 years 11 months 1 day
2013 Warrants [Member] |  |
Derivative warrant liability [Abstract] |  |
Expected volatility (in hundredths) |  | 94.18%
Risk-free interest rates (in hundredths) |  | 1.34%
Expected life (in years) |  | 4 years 3 months 29 days

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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