Net Loss Per Share (Details) - shares shares in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Securities outstanding that could potentially dilute per share data | 16,195 | 22,748 | 23,286 |
| Stock Options Outstanding [Member] | |||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Securities outstanding that could potentially dilute per share data | 16,195 | 14,704 | 14,712 |
| Warrants Outstanding [Member] | |||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Securities outstanding that could potentially dilute per share data | 8,044 | 8,574 | |