Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Apr. 30, 2015	Jan. 31, 2015	Apr. 30, 2014
Accounts receivable, allowance for doubtful accounts	$ 767	$ 850	$ 1,986
Preferred shares, par value	$ 0.0001	$ 0.0001	$ 0.0001
Preferred shares, shares authorized	10,000,000us-gaap_PreferredStockSharesAuthorized	10,000,000us-gaap_PreferredStockSharesAuthorized	10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred shares, shares issued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Common shares, par value	$ 0.0001	$ 0.0001	$ 0.0001
Common shares, shares authorized	200,000,000us-gaap_CommonStockSharesAuthorized	200,000,000us-gaap_CommonStockSharesAuthorized	200,000,000us-gaap_CommonStockSharesAuthorized
Common shares, shares issued	131,543,388us-gaap_CommonStockSharesIssued	130,502,864us-gaap_CommonStockSharesIssued	137,651,372us-gaap_CommonStockSharesIssued
Common shares, shares outstanding	131,543,388us-gaap_CommonStockSharesOutstanding	130,502,864us-gaap_CommonStockSharesOutstanding	137,651,372us-gaap_CommonStockSharesOutstanding

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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