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Basis of Presentation and Significant Accounting Policies (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Long-Lived Assets to be Abandoned [Line Items] |  |  |
Accelerated depreciation | $ 2.2 |  |
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) | 22,926 | 19,443 | 5,566
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) | 7,087 | 5,603 | 3,890
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 | 0 | 67
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) | 15,839 | 13,840 | 1,609
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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