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Basis of Presentation and Significant Accounting Policies (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Long-Lived Assets to be Abandoned [Line Items] |  |  |  |
Accelerated depreciation | $ 1.3 |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of diluted net income (loss) per share (in shares) |  | 19,433 | 5,566 | 3,969
Options for Common Stock [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of diluted net income (loss) per share (in shares) |  | 5,603 | 3,890 | 2,180
Convertible Preferred Stock [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of diluted net income (loss) per share (in shares) |  | 0 | 67 | 254
Warrants for Common Stock [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of diluted net income (loss) per share (in shares) |  | 13,830 | 1,609 | 1,535
Equipment [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful lives |  | 3 years |  |
Equipment [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful lives |  | 7 years |  |
Leasehold Improvements, Buildings and Building Improvements [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful lives |  | 1 year |  |
Leasehold Improvements, Buildings and Building Improvements [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful lives |  | 15 years |  |
Property, Equipment, Building and Leasehold Improvements [Member] |  |  |  |
Long-Lived Assets to be Abandoned [Line Items] |  |  |  |
Accelerated depreciation |  | 1.3 |  |
Impairment loss |  | 0.8 |  |

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