|
Cash, Cash Equivalents and Short-term Investments (Details 2) (USD $)
In Thousands, unless otherwise specified |
Oct. 31, 2013
|
Jan. 31, 2013
|
|---|---|---|
| Available-for-sale securities | ||
| Adjusted Cost | $ 32,917 | $ 66,272 |
| Unrealized Losses | (3) | |
| Fair Value | 32,917 | 66,269 |
|
Money market funds
|
||
| Available-for-sale securities | ||
| Adjusted Cost | 27,468 | 32,522 |
| Fair Value | 27,468 | 32,522 |
|
Commercial paper
|
||
| Available-for-sale securities | ||
| Adjusted Cost | 4,749 | 24,093 |
| Unrealized Losses | (1) | |
| Fair Value | 4,749 | 24,092 |
|
Corporate debt securities
|
||
| Available-for-sale securities | ||
| Adjusted Cost | 700 | 9,657 |
| Unrealized Losses | (2) | |
| Fair Value | $ 700 | $ 9,655 |