|
Summary of Cash and Cash Equivalents (Detail) (USD $)
In Thousands, unless otherwise specified |
Jan. 31, 2014
|
Apr. 30, 2013
|
|---|---|---|
| Cash and Cash Equivalents [Line Items] | ||
| Total cash and cash equivalents | $ 28,692 | $ 25,045 |
|
U.S. Treasury securities
|
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| Cash and Cash Equivalents [Line Items] | ||
| Total cash and cash equivalents | 7,209 | |
|
Demand deposit accounts
|
||
| Cash and Cash Equivalents [Line Items] | ||
| Total cash and cash equivalents | 27,879 | 16,522 |
|
Money Market Funds
|
||
| Cash and Cash Equivalents [Line Items] | ||
| Total cash and cash equivalents | $ 813 | $ 1,314 |