|
Net Loss Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|
| Net Loss Per Share | |||
| Anti-dilutive securities excluded from computation of diluted net loss per share (in shares) | 11,579 | 14,589 | 13,805 |
|
Restricted stock
|
|||
| Net Loss Per Share | |||
| Anti-dilutive securities excluded from computation of diluted net loss per share (in shares) | 1,918 | 3,543 | 3,672 |
|
Stock options
|
|||
| Net Loss Per Share | |||
| Anti-dilutive securities excluded from computation of diluted net loss per share (in shares) | 2,490 | 3,299 | 4,713 |
| Weighted average exercise price (in dollars per share) | $ 4.42 | $ 4.74 | $ 4.56 |
|
ESPP
|
|||
| Net Loss Per Share | |||
| Anti-dilutive securities excluded from computation of diluted net loss per share (in shares) | 42 | 67 | 76 |
|
Convertible notes
|
|||
| Net Loss Per Share | |||
| Anti-dilutive securities excluded from computation of diluted net loss per share (in shares) | 7,129 | 7,680 | 5,344 |