Fair Value Measurements - Additional Information (Detail) - USD ($) |
3 Months Ended | ||
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Apr. 30, 2016 |
Jan. 31, 2016 |
Apr. 30, 2015 |
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| Fair Value Measurements Disclosure [Line Items] | |||
| Fair value measurements of our financial assets and liabilities | $ 15,946,000 | $ 15,922,000 | |
| Assets measured at fair value on nonrecurring basis | $ 0 | $ 0 | |
| Maximum maturity of marketable securities | Three months or less | ||
| Cash equivalents and marketable securities | $ 64,500,000 | 71,100,000 | |
| Restricted cash related to performance obligations | 187,000 | 82,000 | |
| Fair Value, Inputs, Level 3 [Member] | |||
| Fair Value Measurements Disclosure [Line Items] | |||
| Fair value measurements of our financial assets and liabilities | 0 | 0 | |
| Cash Related to Performance Obligations [Member] | |||
| Fair Value Measurements Disclosure [Line Items] | |||
| Restricted cash related to performance obligations | $ 200,000 | $ 100,000 |
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- Definition Aggregate cash, cash equivalents, short term investments and restricted cash. No definition available.
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- Definition Cash Equivalents Maximum Maturity Period No definition available.
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- Definition Fair Value Measurements Disclosure [Line Items] No definition available.
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. No definition available.
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- Definition Fair value of asset after deduction of liability. No definition available.
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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