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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2015
Jan. 31, 2014
Apr. 30, 2014
Apr. 30, 2013
Net loss $ (2,816)us-gaap_NetIncomeLoss $ (574)us-gaap_NetIncomeLoss $ (9,463)us-gaap_NetIncomeLoss $ (5,134)us-gaap_NetIncomeLoss $ (7,406)us-gaap_NetIncomeLoss $ (6,330)us-gaap_NetIncomeLoss
Foreign currency translation adjustment 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 1us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (23)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 100us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 25us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Comprehensive loss $ (2,816)us-gaap_ComprehensiveIncomeNetOfTax $ (573)us-gaap_ComprehensiveIncomeNetOfTax $ (9,463)us-gaap_ComprehensiveIncomeNetOfTax $ (5,157)us-gaap_ComprehensiveIncomeNetOfTax $ (7,306)us-gaap_ComprehensiveIncomeNetOfTax $ (6,305)us-gaap_ComprehensiveIncomeNetOfTax