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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011 | Dec. 31, 2010
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Liabilities measured at fair value on recurring basis, fair value hierarchy of valuation techniques |  |  |  |  |
Common stock warrants, fair value |  | [1] | $ 16,622 | [1] |
Level 1 [Member] |  |  |  |  |
Liabilities measured at fair value on recurring basis, fair value hierarchy of valuation techniques |  |  |  |  |
Common stock warrants, fair value |  | [1] |  | [1] |
Level 2 [Member] |  |  |  |  |
Liabilities measured at fair value on recurring basis, fair value hierarchy of valuation techniques |  |  |  |  |
Common stock warrants, fair value |  | [1] |  | [1] |
Level 3 [Member] |  |  |  |  |
Liabilities measured at fair value on recurring basis, fair value hierarchy of valuation techniques |  |  |  |  |
Common stock warrants, fair value |  | [1] | $ 16,622 | [1] | $ 26,193
[1] | The fair value of common stock warrants is estimated using a Black-Scholes option-pricing model. See Note 11- Convertible Preferred Stock and Stock Warrants for additional information

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- Definition The fair value as of the balance sheet date of firm holdings in corporate stocks (common and preferred), stock options, warrants and any other financial instrument which represents, or provides the ability to obtain, ownership rights in a corporation. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6475986&loc=d3e42546-110969 + Details
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