|
Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2013
|
|---|---|
| Assets | |
| Total Assets | $ 64,903 |
|
Cash [Member]
|
|
| Assets | |
| Total Assets | 2,612 |
|
Money market securities [Member]
|
|
| Assets | |
| Total Assets | 16,330 |
|
Government securities [Member]
|
|
| Assets | |
| Total Assets | |
|
Corporate bonds and commercial paper [Member]
|
|
| Assets | |
| Total Assets | 45,961 |
|
Warrants [Member]
|
|
| Liabilities | |
| Liabilities | 1,988 |
|
Level 1 [Member]
|
|
| Assets | |
| Total Assets | 18,942 |
|
Level 1 [Member] | Cash [Member]
|
|
| Assets | |
| Total Assets | 2,612 |
|
Level 1 [Member] | Money market securities [Member]
|
|
| Assets | |
| Total Assets | 16,330 |
|
Level 1 [Member] | Government securities [Member]
|
|
| Assets | |
| Total Assets | |
|
Level 1 [Member] | Corporate bonds and commercial paper [Member]
|
|
| Assets | |
| Total Assets | |
|
Level 1 [Member] | Warrants [Member]
|
|
| Liabilities | |
| Liabilities | |
|
Level 2 [Member]
|
|
| Assets | |
| Total Assets | 45,961 |
|
Level 2 [Member] | Cash [Member]
|
|
| Assets | |
| Total Assets | |
|
Level 2 [Member] | Money market securities [Member]
|
|
| Assets | |
| Total Assets | |
|
Level 2 [Member] | Government securities [Member]
|
|
| Assets | |
| Total Assets | |
|
Level 2 [Member] | Corporate bonds and commercial paper [Member]
|
|
| Assets | |
| Total Assets | 45,961 |
|
Level 2 [Member] | Warrants [Member]
|
|
| Liabilities | |
| Liabilities | |
|
Level 3 [Member]
|
|
| Assets | |
| Total Assets | |
|
Level 3 [Member] | Cash [Member]
|
|
| Assets | |
| Total Assets | |
|
Level 3 [Member] | Money market securities [Member]
|
|
| Assets | |
| Total Assets | |
|
Level 3 [Member] | Government securities [Member]
|
|
| Assets | |
| Total Assets | |
|
Level 3 [Member] | Corporate bonds and commercial paper [Member]
|
|
| Assets | |
| Total Assets | |
|
Level 3 [Member] | Warrants [Member]
|
|
| Liabilities | |
| Liabilities | $ 1,988 |