|
Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2012
|
|---|---|
| Assets | |
| Assets | $ 97,962 |
|
Cash [Member]
|
|
| Assets | |
| Assets | 3,690 |
|
Money market securities [Member]
|
|
| Assets | |
| Assets | 10,466 |
|
Government securities [Member]
|
|
| Assets | |
| Assets | |
|
Corporate bonds and commercial paper [Member]
|
|
| Assets | |
| Assets | 83,806 |
|
Warrants [Member]
|
|
| Liabilities | |
| Liabilities | 7,667 |
|
Level 1 [Member]
|
|
| Assets | |
| Assets | 14,156 |
|
Level 1 [Member] | Cash [Member]
|
|
| Assets | |
| Assets | 3,690 |
|
Level 1 [Member] | Money market securities [Member]
|
|
| Assets | |
| Assets | 10,466 |
|
Level 1 [Member] | Government securities [Member]
|
|
| Assets | |
| Assets | |
|
Level 1 [Member] | Corporate bonds and commercial paper [Member]
|
|
| Assets | |
| Assets | |
|
Level 1 [Member] | Warrants [Member]
|
|
| Liabilities | |
| Liabilities | |
|
Level 2 [Member]
|
|
| Assets | |
| Assets | 83,806 |
|
Level 2 [Member] | Cash [Member]
|
|
| Assets | |
| Assets | |
|
Level 2 [Member] | Money market securities [Member]
|
|
| Assets | |
| Assets | |
|
Level 2 [Member] | Government securities [Member]
|
|
| Assets | |
| Assets | |
|
Level 2 [Member] | Corporate bonds and commercial paper [Member]
|
|
| Assets | |
| Assets | 83,806 |
|
Level 2 [Member] | Warrants [Member]
|
|
| Liabilities | |
| Liabilities | |
|
Level 3 [Member]
|
|
| Assets | |
| Assets | |
|
Level 3 [Member] | Cash [Member]
|
|
| Assets | |
| Assets | |
|
Level 3 [Member] | Money market securities [Member]
|
|
| Assets | |
| Assets | |
|
Level 3 [Member] | Government securities [Member]
|
|
| Assets | |
| Assets | |
|
Level 3 [Member] | Corporate bonds and commercial paper [Member]
|
|
| Assets | |
| Assets | |
|
Level 3 [Member] | Warrants [Member]
|
|
| Liabilities | |
| Liabilities | $ 7,667 |