Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified |
Apr. 30, 2014
|
Jan. 31, 2014
|
---|---|---|
Financial assets: | ||
Cash and cash equivalents | $ 100,756 | $ 112,271 |
Available for sale marketable securities: | ||
Marketable securities, short-term | 7,066 | 5,555 |
Non-current marketable securities: | ||
Marketable securities, long-term | 6,284 | 6,814 |
Total | 116,607 | 128,103 |
Money Market Accounts [Member]
|
||
Financial assets: | ||
Cash and cash equivalents | 2,501 | 3,463 |
U.S. Treasury Notes and Bonds Conventional [Member]
|
||
Available for sale marketable securities: | ||
Marketable securities, short-term | 3,527 | 3,545 |
U.S. Government Agency Issues Short Term [Member]
|
||
Available for sale marketable securities: | ||
Marketable securities, short-term | 3,539 | 2,010 |
U.S. Government Agency Issues Long Term [Member]
|
||
Non-current marketable securities: | ||
Marketable securities, long-term | 6,284 | 6,814 |
Fair Value, Inputs, Level 1 [Member]
|
||
Financial assets: | ||
Cash and cash equivalents | 100,756 | 112,271 |
Non-current marketable securities: | ||
Total | 106,784 | 119,279 |
Fair Value, Inputs, Level 1 [Member] | Money Market Accounts [Member]
|
||
Financial assets: | ||
Cash and cash equivalents | 2,501 | 3,463 |
Fair Value, Inputs, Level 1 [Member] | U.S. Treasury Notes and Bonds Conventional [Member]
|
||
Available for sale marketable securities: | ||
Marketable securities, short-term | 3,527 | 3,545 |
Fair Value, Inputs, Level 1 [Member] | U.S. Government Agency Issues Short Term [Member]
|
||
Available for sale marketable securities: | ||
Marketable securities, short-term | ||
Fair Value, Inputs, Level 1 [Member] | U.S. Government Agency Issues Long Term [Member]
|
||
Non-current marketable securities: | ||
Marketable securities, long-term | ||
Fair Value, Inputs, Level 2 [Member]
|
||
Financial assets: | ||
Cash and cash equivalents | ||
Non-current marketable securities: | ||
Total | 9,823 | 8,824 |
Fair Value, Inputs, Level 2 [Member] | Money Market Accounts [Member]
|
||
Financial assets: | ||
Cash and cash equivalents | ||
Fair Value, Inputs, Level 2 [Member] | U.S. Treasury Notes and Bonds Conventional [Member]
|
||
Available for sale marketable securities: | ||
Marketable securities, short-term | ||
Fair Value, Inputs, Level 2 [Member] | U.S. Government Agency Issues Short Term [Member]
|
||
Available for sale marketable securities: | ||
Marketable securities, short-term | 3,539 | 2,010 |
Fair Value, Inputs, Level 2 [Member] | U.S. Government Agency Issues Long Term [Member]
|
||
Non-current marketable securities: | ||
Marketable securities, long-term | 6,284 | 6,814 |
Fair Value, Inputs, Level 3 [Member]
|
||
Financial assets: | ||
Cash and cash equivalents | ||
Non-current marketable securities: | ||
Total | ||
Fair Value, Inputs, Level 3 [Member] | Money Market Accounts [Member]
|
||
Financial assets: | ||
Cash and cash equivalents | ||
Fair Value, Inputs, Level 3 [Member] | U.S. Treasury Notes and Bonds Conventional [Member]
|
||
Available for sale marketable securities: | ||
Marketable securities, short-term | ||
Fair Value, Inputs, Level 3 [Member] | U.S. Government Agency Issues Short Term [Member]
|
||
Available for sale marketable securities: | ||
Marketable securities, short-term | ||
Fair Value, Inputs, Level 3 [Member] | U.S. Government Agency Issues Long Term [Member]
|
||
Non-current marketable securities: | ||
Marketable securities, long-term |