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Earnings Per Share (Antidilutive Securities) (Details) (USD $)
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12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Jan. 31, 2008
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Dec. 31, 2013
Stock Options [Member]
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Dec. 31, 2012
Stock Options [Member]
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Dec. 31, 2011
Stock Options [Member]
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Dec. 31, 2013
Unvested stock awards [Member]
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Dec. 31, 2012
Unvested stock awards [Member]
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Dec. 31, 2011
Unvested stock awards [Member]
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Dec. 31, 2013
Warrants [Member]
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Dec. 31, 2012
Warrants [Member]
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Dec. 31, 2011
Warrants [Member]
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| Outstanding equity awards not included in the calculation of diluted net loss per share: | ||||||||||
| Number of equity awards not included in the calculation of diluted net loss per share | 5,879,842 | 8,952,129 | 7,314,039 | 92,811 | 655,402 | 2,221,205 | 1,602,489 | 1,602,489 | 1,602,489 | |
| Range of exercise prices, lower limit | $ 1.55 | $ 0.47 | $ 0.47 | |||||||
| Range of exercise prices, upper limit | $ 15.15 | $ 16.36 | $ 16.36 | |||||||
| Warrants, exercise price | 2.40 | 2.40 | 2.40 | 2.40 | ||||||