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Summary of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Summary of Significant Accounting Policies [Abstract] |  |  |  |
Number of shares excluded from the computation of net loss per share |  |  | 15,832,208 | 13,110,708
Reclassification of general and administrative expenses | $ 200 | $ 100 |  | $ 400
Reclassification of additional lease incentives |  |  |  | $ 1,100

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- Definition Reclassification of additional lease incentives recorded in accounts payable and accrued expenses to lease incentives received. + References No definition available. + Details
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- Definition Reclassification of general and administrative expenses relating to patent and other costs to research and development expenses. + References No definition available. + Details
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- Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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