| **Net Loss Per Share**            | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
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| **Net Loss Per Share [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Net Loss Per Share                | 4.  Net Loss Per ShareBasic net loss per share amounts have been computed by dividing net loss by the weighted-average number of common shares outstanding during the period. For each of the periods presented below, we reported net losses and, accordingly, potential dilutive common shares were not included in the computation of diluted net loss per share since it would have been anti-dilutive. The calculations of net loss per share, basic and diluted, are as follows:  Net Loss (Numerator)  Weighted Average Common Shares (Denominator)(in thousands)  Per Share Amount Three months ended June 30, 2014      Basic and diluted $(11,073)  63,743  $(0.17)Six months ended June 30, 2014            Basic and diluted $(20,386)  66,775  $(0.31)Three months ended June 30, 2013            Basic and diluted $(12,263)  51,481  $(0.24)Six months ended June 30, 2013            Basic and diluted $(23,521)  50,802  $(0.46)For these periods, anti-dilutive common shares excluded from diluted per share amounts consist of the following:  Three Months Ended June 30,  2014  2013  WeightedAverage Number(in thousands)  WeightedAverage Exercise Price  WeightedAverage Number(in thousands)  WeightedAverage Exercise PriceOptions  6,261  $10.14   6,340  $11.62  Six Months Ended June 30,  2014  2013  WeightedAverage Number(in thousands)  WeightedAverage Exercise Price  WeightedAverage Number(in thousands)  WeightedAverage Exercise PriceOptions  6,066  $10.43   6,036  $11.97 |

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| - Definition
The entire disclosure for earnings per share.
+ References
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