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Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified |
Oct. 31, 2014
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Jan. 31, 2014
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|---|---|---|
| Available for sale marketable securities: | ||
| Marketable securities, short-term | $ 6,025 | $ 5,555 |
| Non-current marketable securities: | ||
| Marketable securities, long-term | 7,784 | 6,814 |
| Total | 15,855 | 15,832 |
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Money Market Accounts [Member]
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| Financial assets: | ||
| Cash and cash equivalents | 2,046 | 3,463 |
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U.S. Treasury Notes and Bonds Conventional [Member]
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| Available for sale marketable securities: | ||
| Marketable securities, short-term | 501 | 3,545 |
| Non-current marketable securities: | ||
| Marketable securities, long-term | 3,519 | |
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U.S. Government Agency Issues Short Term [Member]
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| Available for sale marketable securities: | ||
| Marketable securities, short-term | 5,524 | 2,010 |
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U.S. Government Agency Issues Long Term [Member]
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| Non-current marketable securities: | ||
| Marketable securities, long-term | 4,265 | 6,814 |
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Fair Value, Inputs, Level 1 [Member]
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| Non-current marketable securities: | ||
| Total | 6,066 | 7,008 |
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Fair Value, Inputs, Level 1 [Member] | Money Market Accounts [Member]
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| Financial assets: | ||
| Cash and cash equivalents | 2,046 | 3,463 |
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Fair Value, Inputs, Level 1 [Member] | U.S. Treasury Notes and Bonds Conventional [Member]
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| Available for sale marketable securities: | ||
| Marketable securities, short-term | 501 | 3,545 |
| Non-current marketable securities: | ||
| Marketable securities, long-term | 3,519 | |
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Fair Value, Inputs, Level 2 [Member]
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| Non-current marketable securities: | ||
| Total | 9,789 | 8,824 |
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Fair Value, Inputs, Level 2 [Member] | U.S. Government Agency Issues Short Term [Member]
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| Available for sale marketable securities: | ||
| Marketable securities, short-term | 5,524 | 2,010 |
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Fair Value, Inputs, Level 2 [Member] | U.S. Government Agency Issues Long Term [Member]
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| Non-current marketable securities: | ||
| Marketable securities, long-term | $ 4,265 | $ 6,814 |