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Fair Value Measurements (Details) (USD $) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] | Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Put Option [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Put Option [Member] | Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Warrants [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Warrants [Member] | Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 1 [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 1 [Member] | Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 1 [Member] Put Option [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 1 [Member] Put Option [Member] | Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 1 [Member] Warrants [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 1 [Member] Warrants [Member] | Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 2 [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 2 [Member] | Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Put Option [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Put Option [Member] | Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Warrants [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Warrants [Member] | Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Put Option [Member] | Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Put Option [Member] | Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Warrants [Member] | Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Warrants [Member]
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | $ 8,645,000 | $ 6,145,000 |  |  |  |  | $ 8,645,000 | $ 6,145,000 |  |  |  |  | $ 0 | $ 0 |  |  |  |  | $ 0 | $ 0 |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Put option liability | (2,500,000) | (2,250,000) |  |  | (2,500,000) | (2,250,000) |  |  |  |  | 0 | 0 |  |  |  |  | 0 | 0 |  |  |  |  | (2,500,000) | (1,640,000) |  |
Warrant liability |  |  |  |  |  |  | (84,000) | (418,000) |  |  |  |  | 0 | 0 |  |  |  |  | 0 | 0 |  |  |  |  | (84,000) | (757,000)
Change in Level 3 put option liability [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | (2,500,000) | (2,250,000) |  |  | (2,500,000) | (2,250,000) |  |  |  |  | 0 | 0 |  |  |  |  | 0 | 0 |  |  |  |  | (2,250,000) | (1,910,000) |  |
Increase (Decrease) in fair value recognized in operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (250,000) | 270,000 | 334,000 | (130,000)
Ending balance | (2,500,000) | (2,250,000) |  |  | (2,500,000) | (2,250,000) |  |  |  |  | 0 | 0 |  |  |  |  | 0 | 0 |  |  |  |  | (2,500,000) | (1,640,000) |  |
Change in Level 3 warrant liability [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  | (84,000) | (418,000) |  |  |  |  | 0 | 0 |  |  |  |  | 0 | 0 |  |  |  |  | (418,000) | (627,000)
Increase in fair value recognized in operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (250,000) | 270,000 | 334,000 | (130,000)
Ending balance |  |  |  |  |  |  | $ (84,000) | $ (418,000) |  |  |  |  | $ 0 | $ 0 |  |  |  |  | $ 0 | $ 0 |  |  |  |  | $ (84,000) | $ (757,000)

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- Definition Obligation reflecting another party's right to economic interests in another entity or trust under a contractual right. For example, an investor may purchase a beneficial interest in a securitization transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 8, 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of increase (decrease) of liabilities measured at fair value on a recurring basis using unobservable inputs (level 3) which have taken place during the period. Such increase (decrease) may be comprised of changes in fair value (gains or losses) whether realized or unrealized that have been included in earnings, changed net asset value, or other comprehensive income (a separate component of shareholders' equity); purchases, sales, issues, or settlements of assets; and net transfers in to or out of this category within the fair value hierarchy. + 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 (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1), c(2), c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 98-5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 00-27 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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